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

Time that Jane took to jog 15 km = 30 min

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

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

When Jane took 20 min to jog 10 km, Eliza took the same time to jog 5 km.

1 km = 1000 m
5 km = 5000 m

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

Answer(s): 250 m/min