61 P6.SP.TL.18012225
Level 3
Min and Candy take 1 hour to clean the kennel together. If Min takes 3 hours to clean the kennel on her own, how long will it take Candy to clean the kennel alone?
3 m
Rate more than 1 object Duration
62 P6.SP.TL.18012226
Level 3
It takes Angel 9 hours to sew a blouse by herself. If Belina helps her, they will take 5 hours to sew the blouse. How long will Belinda take to sew the blouse by herself? Express the answer in mixed number.
3 m
Rate more than 1 object Duration
63 P6.SP.TL.18012228
Level 3
Ronnie and Dave, together, can clean a room in 3 hours. If Ronnie is cleaning the room alone, he can only complete the task in 9 hours. How long will Dave take to clean a room all by himself? Express the answer in mixed number.
3 m
Rate more than 1 object Duration Mixed numbers
64 P6.SP.TL.18012230
Level 3
8 workers take 10 hours to build 4 bookshelves. How many hours will 6 workers take to build 2 bookshelves? Express the answer in mixed number of hours.
3 m
Rate more than 1 object Duration Mixed numbers
65 P6.SP.JC.21010801
Level 3
50 men working 8 hours a day can finish building a boat in 10 days. How long would it take 60 men to finish building the same boat if they work the same number of hours a day?
3 m
Rate more than 1 object Duration
66 P6.SP.TL.18012229
Level 3
Machine X takes 5 minutes to cut 85 pieces of lumbers. Machine Y takes 15 minutes to cut 120 pieces of lumbers. Machine Z takes 10 minutes to cut 120 pieces of lumber.
  1. Which is the faster combination, X and Y or Y and Z? (Eg A, B)
  2. In 1 minute, how many more pieces of lumbers can be cut by the faster combination compared to the other combination?
3 m
Rate more than 1 object Duration More than or less than
67 P6.SP.TL.18012221
Level 3
Beryl has 2 containers. A and B of different capacities. If Container A is filled by a tap at a rate of 3 litres per minute and Container B is filled by a tap at a rate of 5 litres per minute, when Container A is completely filled, 5 litres of water flowed out from Container B. If Container A is filled by a tap at a rate of 4 litres per minute and Container B is filled by a tap at a rate of 3 litres per minute, when Container A is completely filled, Container B is only half-filled. What is the capacity of Container B?
3 m
Rate more than 1 object Volume Fraction of a whole Double if Units table Units & parts Elimination
68 P6.SP.JC.18011324
Level 3
It takes Faucet A 30 minutes to fill a tank measuring 12 cm by 10 cm by 22 cm completely while it takes Faucet B only 25 minutes. How long will it take to completely fill the tank with water if both the faucets are turned on at the same time? Leave the answer in minutes and round off to 2 decimal places.
3 m
Rate more than 1 object Duration Volume Filling tank D Place values D Round off Units method
69 P6.SP.JC.17053055
Level 3
Tap A can fill a tank completely in 2 hours while Tap B takes an hour more to fill the same tank completely. There is a hole at the bottom of the tank which can empty the full tank in 6 hours. How long does it take for the tank to be completely filled if both taps are turned on?
3 m
Rate more than 1 object Duration Volume Same starting time Filling tank Units method
70 P6.SP.JC.17053160
Level 3
The figure shows a rectangular tank measuring 30 cm by 15 cm by 20 cm. Vera poured 558 mℓ of water into the tank. Then she turned on two taps at the same time to fill up Tank with water. Water was flowing from both taps at the same rate. After 5 minutes, both taps were turned off but 1.2ℓ of water had overflowed and was collected in a tray. Find the rate of the flow of water of each tap in millimetres per minute.
3 m
Rate more than 1 object Unit conversion Volume Volume of cuboid Filling tank Units method
71 P6.SP.JC.17080918
Level 3
A rectangular tank measuring 60 cm by 50 cm by 25 cm was to be filled with water by two taps, A and B. Tap A which fills the tank at a rate of 8ℓ per minute was first turned on for 5 minutes before Tap B was turned on as well. If the tank was filled to the brim in a total of 7 minutes from the time when Tap A was first turned on, what is the rate at which Tap B fills the tank? Give the answer in ℓ per minute correct to 1 decimal place.
3 m
Rate more than 1 object Unit conversion Volume Volume of cuboid Filling tank D Place values D Round off
72 P6.SP.JC.17080914
Level 3
An empty rectangular tank has a capacity of 90ℓ and a height of 50 cm. At 10 am, Tap A is turned on to fill the tank at a rate of 4ℓ per minute for 15 minutes. After 5 minutes, Tap B is turned on to drain water from the tank at a rate of 2ℓ per minute for 18 minutes. What is the height of the water level in the tank in the end? Express the answer in 1 decimal place.
3 m
Rate more than 1 object Unit conversion Volume Volume of cuboid Height of cuboid Filling tank D Place values D Round off
73 P6.SP.JC.17053049
Level 3
Tank A measuring 54 cm by 14 cm by 25 cm contains 4.7 ℓ of water. It is being filled with water flowing from Tap X at 0.9ℓ/min and Tap Y at 995 mℓ/min. Both taps are turned on at the same time. How long does it take to fill up Tank A till it is 75% full? Correct the answer to 1 decimal place.
3 m
Rate more than 1 object Unit conversion Volume Volume of cuboid Filling tank D Place values D Round off Percent of a whole
74 P6.SP.TL.18012222
Level 2
Tony drove a distance of 15 km in 10 minutes.
  1. What was his speed in km/h?
  2. How long will it take him to cover 360 km at this speed? Express the answer in hours.
3 m
DST triangle Average speed Unit conversion Duration
75 P6.SP.TL.18012224
Level 2
A van covers a distance of 45 km in 25 minutes.
  1. At what speed is it travelling?
  2. How long will it take to cover a distance of 36 km?
3 m
DST triangle Average speed Unit conversion Duration
76 P6.SP.TL.18012210
Level 3
Sam took 2 hours to walk from Building A to Building B which was 6 km away. On his way back from Building B to Building A, he increased his average walking speed by 1 km/h. How long did he take for his journey back?
3 m
DST triangle Average speed Journey by parts Different speed Duration More than or less than
77 P6.SP.TL.18012232
Level 3
Jake walks to school at an average speed of 4 km/h every day. One day, after walking a distance of 1 km, he realised that his watch was slow. So, he ran at a constant speed and managed to reach his school just on time. Later, he calculated that if he had run at this speed right from the start of the journey, he would have reached his school 5 minutes earlier. What was his running speed?
3 m
DST triangle Average speed Different speed Unit conversion Duration
78 P6.SP.TL.18012233
Level 3 PSLE
Peter and Justin ran in a race around a 400 m track. Peter ran at a speed of 190 m/min and Justin at a speed that was 25 m/min slower than Peter throughout the race. How many complete rounds would Peter have finished when he had run a distance of 300 m more than Justin?
3 m
DST triangle Different speed Duration More than or less than
79 P6.SP.TL.18012234
Level 3
Ryan drove at an average speed of 70 km/h for the first 2 hours of the journey. He then increased his average speed by 15 km/h and drove for another 3 hours until he reached his town. Find his average speed for the whole journey.
3 m
DST triangle Average speed Different speed
80 P6.SP.TL.18012235
Level 3
Jesse left home at 6.15 a.m. and drove towards the mountain which was 802 km away. For the first 210 km, she was travelling at 70 km/h. Then she increased her speed by 4 km/h and completed the remaining journey.
  1. How long did she take for her whole journey?
  2. At what time did she reach the mountain?
3 m
DST triangle Average speed Journey by parts Different speed Start end time

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