Level 2 PSLE
Elsa and Ana started jogging from the same place in opposite directions along a straight path. They jogged for 40 minutes. At the end of the jog, they were 7 km apart. Elsa's average speed was 6 km/h. What was Ana's average speed in km/h?
Level 2
Martin and Ervin started together from the same bus-stop and ran along a track at the speed of 11 km/h and 7 km/h respectively. How far apart would they be in 15 minutes? Express the answer in km.
Level 2 PSLE
A bottle completely filled with water weighed 1.9 kg. After 23 of the water was used up, the bottle with the remaining water weighed 800 g. What was the mass of the empty bottle in grams?