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Raffles Girls SA2 Paper 2 Question 17

Mary started cycling from home to school at a speed of 300m/min at 6a.m. Her brother started cycling from home later. They were beside each other at 6.30 a.m. and her brother reached school at 7.m while Mary was still 1800 m away. If both of them travelled at a constant speed throughout the journey, what time did her brother leave home?

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