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15 September, 05:19

An airplane travels 2100 km at a speed of 500 km/hr encounters a head wind that decreases its speed to 400km/h for the next three hours and then travels the last 400km to complete the trip at an average speed for the entire trip of 440 km/h what was the speed of the plane for the last part of the trip

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  1. 15 September, 05:39
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    Need to work out the time and distance

    it flew each segment.

    2100/500=4.2 hrs

    400 km for 3 hrs = 1200km

    total distance = 2100 + 1200 + 400 = 3700km

    av speed is 440km/h so total time travelled is 3700/440 = 8.40909hrs so flew last distance in 8.4909-4.2-3=1.20909hrs

    400km in 1.20909hrs

    =330.827km/hr

    which means I've read question wrong
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