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13 April, 23:19

A plane loaded with cargo travels 2000 miles at an average speed of 400 Miles per hour. On the return trip on the same route it travels at an average speed of 480 miles per hour. How much quicker was the return trip

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  1. 13 April, 23:48
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    The trip was 434mph quicker.

    Explanation:

    Time taken for case 1 = distance / time = 2000/400 = 5hrs

    Time taken in case 2 = distance / time = 2000/480 = 4.2hrs

    Time taken for the entire journey = 5 + 4.2 = 9.2hrs

    Total distance = 2000 + 2000 = 4000miles

    Total speed = total distance / total time

    Total speed = 4000/9.2 = 434.78mph
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