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31 October, 01:04

10. It is 21,000 kilometers around the earth and the earth rotates in 24 hrs. How fast is it rotating

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  1. 31 October, 01:09
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    Speed is measured in miles per hour (mph).

    The formula Distance equals rate times time (d=rt) can be rearranged and the rate can be solved,

    d = r*t = > r = d / t. d = 100 miles, time = 6 hours, Rate = 16.66 mph (16 and two thirds).

    The same formula can be used for the second part,

    21000 / 24 = rate, Rate = 875 kilometers per hour
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