Question
PSLE
Harper and Nora started their walk around a 23-km track at 9.00 a.m. They started at the same point but went in opposite direction. Harper's walking speed was 6 km/h and Nora was 4 km/h. They did not change their speeds throughout. At what time did they first pass each other?
2 m

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PSLE
Harper and Nora started their walk around a 23-km track at 9.00 a.m. They started at the same point but went in opposite direction. Harper's walking speed was 6 km/h and Nora was 4 km/h. They did not change their speeds throughout. At what time did they first pass each other?