PSLE
Nora and Ava started jogging from the same point of the 15 km track round a lake. They started at the same time but in opposite directions. Nora jogged past Ava after 10 km. Both of them did not change their speeds throughout. Nora took 30 min to complete one round. What was Ava's jogging speed in m/min?
Distance that Ava jogged when they passed each other
= 15 - 10
= 5 km

Time that Nora took to jog 15 km = 30 min

Time that Nora took to jog 1 km
= 30 ÷ 15
= 2 min

Time that Nora took to jog 10 km
= 10 x 2
= 20 min

When Nora took 20 min to jog 10 km, Ava took the same time to jog 5 km.

1 km = 1000 m
5 km = 5000 m

Ava's jogging speed
= 5000 ÷ 20
= 250 m/min

Answer(s): 250 m/min