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    Question

    Section 4

    Ratio of speed of boat in downstream and speed of stream

    is 5:3, if speed of current is 9 km/hr, then find distance travelled (in km) upstream in 8 hours.
    A 84 km Correct Answer Incorrect Answer
    B 72 km Correct Answer Incorrect Answer
    C 90 km Correct Answer Incorrect Answer
    D 60 km Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let speed of downstream and speed of stream be 5x and 3x respectively. Speed of current => 3x = 9 => x = 3 km/hr Downstream speed = 5 × 3 = 15 km/h Speed of boat = 15 - 3 = 12 km/hr Upstream speed = 12 - 3 = 9 km/h Distance travelled upstream in 8 hr = 8 × 9 = 72 km

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