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College math

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A planehas 7 hrs. to reach a target and come back to base. it flies out to the target at 480 miles per hr. and returns on the same route at 640 miles per hour. how many miles from the base is the target?

  • College math -

    let the time for the "out-trip" be t hours
    then the return trip took 7-t hours

    so first distance = 480t miles
    return distance = 640(7-t)miles

    but aren't the two distances equal ?
    so solve

    480t = (640(7-t)

    then sub your value of t into 480t

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