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12 August, 00:05

Two boats are moving towards each other from harbours that are 144 km apart. One boat is moving at 63 km. h-1 and the other boat at 81 km. h-1. If both started their journey at the same time, how long will they take to pass each other?

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  1. 12 August, 01:57
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    Answer: 1 hour

    Step-by-step explanation:

    Let distance1 = x km

    Distance2 = 144 - x

    Speed S1 = 63 kph

    Speed S2 = 81 kph

    Time = Distance / Speed

    When the jets pass each other

    (144-x) / 81 = x/63

    63 (144-x) = 81x

    9072 - 63x = 81x

    x = 9072 / 144

    x = 63 km

    Time = 63/63 = 1 hour
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