61 P6.SP.JC.21061118
Level 3 PSLE
Alice and Hilda started jogging from the same point of a 5 km track round a housing estate. They started at the same time but in opposite directions. Alice jogged past Hilda after 2 km. Both of them did not change their speeds throughout. Alice took 30 min to complete one round. What was Hilda's jogging speed in m/min?
3 m
DST Triangle Average speed Same starting point Same starting time Opposite direction Circular track
62 P6.SP.TL.18012266
Level 3
At 7 a.m., a black car and a green car left the office and travelled at average speeds in opposite directions round a 25-km route. The black car took 15 minutes to complete each round while the green car took 20 minutes.
  1. Find the speed of the black car.
  2. Find the speed of the green car.
  3. If the 2 cars travelled without any interval of rest, at what time would the 2 cars next meet again at the office?
3 m
DST triangle Average speed Same starting point Same starting time Opposite direction Circular track Unit conversion Duration LCM
63 P6.SP.TL.18012268
Level 3
Bus X and Bus Y left the same bus station at uniform speeds in the same direction round a 48-km circular route. Bus X took 45 minutes to complete each round while Bus Y took 30 minutes.
  1. How long would it take Bus Y to meet Bus Y for the first time? Express the answer in mixed number of hours.
  2. How far would Bus X be behind Bus Y after 12 hour?
3 m
DST triangle Average speed Same starting point Circular track Unit conversion Duration LCM
64 P6.SP.TL.18012269
Level 3
Helen and Jomarie started off from the same place and drove at uniform speeds in the same direction round a 40-km circular racing track. Helen completed each round in 40 minutes. Jomarie took 50 minutes to complete each round.
  1. How far would Jomarie be behind Helen after 1 hour?
  2. How long after they started would it take Helen to meet Jomarie for the first time?
3 m
DST triangle Average speed Same starting point Meeting point Distance apart Circular track Unit conversion Duration LCM
65 P6.SP.JC.21061115
Level 3 PSLE
At 15 25, Mrs Pang started driving at 60 km/h from her home to a supermarket 35 km away. She was in the supermarket for 1 h 15 min.
  1. What time did she leave the supermarket?
  2. After leaving the supermarket, Mrs Pang drove back along the same route and took 48 min to reach home. What was her average speed, in km/h, for the journey home?
4 m
DST triangle Average speed Start end time Duration Timeline F Division

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