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Question
Roger and Margaret made a journey to a historical site located 864 km away from their city.
Margaret left the city at 7 a.m. which was 1 h 40 minutes earlier than Roger.
However, Roger reached the historical site 2 h 20 minutes earlier than Margaret.
If the average speed of Roger was 72 km/h, find Margaret's average speed.
The correct answer is : 54