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30 September, 22:57

An airplane travels 2836 km against the wind in 4 hours and 3156 km with the wind in the same amount of time. What is the rate of the plane in still air and what is the rate of the wind?

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  1. 1 October, 00:15
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    with wind velocity = 3156/4 = 789 mph

    against wind velocity = 2836/4 = 709 mph

    (789/709) / 2 = 40 mph

    wind velocity = 40 mph

    plane velocity = 789 - 40 = 749 mph
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