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31 August, 16:03

It took Mary 1.5 hours to bicycle 39km. Then she slowed down and took another 3 hours to bicycle 51 km more. Find her average speed for the trip

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  1. 31 August, 17:12
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    Average speed = (total distance) / (total time)

    average speed = (39 + 51) / (1.5 + 3)

    = 90 / 4.5

    = 20 km per hr <==
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