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    Question

    Speed of boat is 10 km/hr. Speed of the stream is 20%

    less than speed of boat. Then find time taken by boat to go 90 km downstream?
    A 3 hrs Correct Answer Incorrect Answer
    B 2.5 hrs Correct Answer Incorrect Answer
    C 5 hrs Correct Answer Incorrect Answer
    D 4 hrs Correct Answer Incorrect Answer

    Solution

    Speed of stream = 10 × (80/100) = 8 km/hr Time taken to go 90 km = 90/(10 + 8) = 5 hrs

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