The river boat paddled upstream at 12km/h, stopped for 2 h of sightseeing, and paddled back at 18km/h. How far upstream did the boat travel if the total time for the trip, including the stop, was 7h?

Please help me, the answer is 36 km but i have no idea how to set it up

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asked by bert
  1. Let D be the distance travelled. The total time moving was 7 - 2 = 5 hours.

    Realize that time time spent travelling in one direction is D/V, where V is the speed.
    Here is what you know:
    D/12 + D/18 = 5 hours
    Create a common denominator.
    (3D + 2D)/36 = 5
    5D/36 = 5
    D = 36 km

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    posted by drwls

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