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    Question

    Speed of boat is 20 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 = 20 times; (80/100) = 16 km/hr Time taken to go 90 km = 90/(20 + 16) = 2.5 hrs

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