Question
PSLE
Aria and Ruby started jogging from the same point of the 6 km track round a park. They started at the same time but in opposite directions. Aria jogged past Ruby after 4 km. Both of them did not change their speeds throughout. Aria took 15 min to complete one round. What was Ruby's jogging speed in m/min?
3 m

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PSLE
Aria and Ruby started jogging from the same point of the 6 km track round a park. They started at the same time but in opposite directions. Aria jogged past Ruby after 4 km. Both of them did not change their speeds throughout. Aria took 15 min to complete one round. What was Ruby's jogging speed in m/min?