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2 September, 06:03

How far from an airport can an airplane fly and return in 8 hours, if it's outgoing speed is 160 km per hour and it's returning speed is 240 km per hour

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Answers (2)
  1. 2 September, 07:02
    0
    speed = distance/time

    total time is 8 hours

    outgoing speed is 160 km per hour,

    so time = d/160

    returning speed is 240 km per hour,

    so time = d/240

    d/160 + d/240 = 8

    3d/480 + 2d/480 = 8

    5d/480 = 8

    5d = 480 (8)

    5d = 3840

    d=3840/5

    d=768

    answer: so the distance is 768 km
  2. 2 September, 08:57
    0
    T = 8 h

    v1 = 160 km/h

    v2 = 240 km/h

    mmc 160 e 240 = 80

    s = 80*8

    s = 640 km
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