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

Time that Opal took to jog 15 km = 30 min

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

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

When Opal took 20 min to jog 10 km, Kitty took the same time to jog 5 km.

1 km = 1000 m
5 km = 5000 m

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

Answer(s): 250 m/min