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25 January, 21:42

A light aircraft travels 2 miles per hour less than twice the speed of a van. If the van can travel 171 miles in the same time it takes the aircraft to travel 336 miles, then what is the average speed of each?

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  1. 25 January, 23:45
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    The answers to the question are as follows

    The average speed of the aircraft = 112 miles/hr and

    the average speed of the van = 57 miles/hr

    Explanation:

    Speed of the van = X

    Speed of the aircraft = Y = 2 * X - 2 miles/hour

    Distance covered by van in time t = 171 miles

    Distance covered by aircraft in time t = 336 miles

    Therefore Y * t = 336 miles and

    X * t = 171 miles

    Therefore (2·X - 2) * t = 336 miles

    and t = (171 miles) / X

    (2·X - 2) * (171 miles) / X = 336 miles

    (342·X-342) / X = 336 → 6·X = 342

    Therefore X = 57 miles/hour

    and Y = 2*57 - 2 = 112 miles/hr
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