Question
Nora started jogging from the park to the reservoir at a speed of 100 m/min at 6 a.m. Her sister started jogging from the park later. They were beside each other at 6.36 a.m. and her sister reached the reservoir at 7 a.m. while Nora was still 1200 m away. If both of them travelled at a constant speed throughout the journey, what time did her sister leave the park?
4 m

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Nora started jogging from the park to the reservoir at a speed of 100 m/min at 6 a.m. Her sister started jogging from the park later. They were beside each other at 6.36 a.m. and her sister reached the reservoir at 7 a.m. while Nora was still 1200 m away. If both of them travelled at a constant speed throughout the journey, what time did her sister leave the park?