Question

    If a boat travels 35 km more in downstream than in

    upstream in 5 hr and if the speed of the boat in still water is 25 km/hr, then find the distance travelled by boat in downstream in 4 hr?
    A 116 Correct Answer Incorrect Answer
    B 122 Correct Answer Incorrect Answer
    C 114 Correct Answer Incorrect Answer
    D 100 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    S is the speed of boat in still water = 25 km/hr
    Speed of upstream = 25 + x
    Speed in downstream = 25 - x
    Distance in downstream - distance in upstream =35 km {given}
    According to question,
    (25 + x) times; 5 - (25 - x) times; 5 = 35
    (25 + x) - (25 - x) = 7
    2x = 7
    x = 3.5 km/hr
    Distance in downstream in 4 hr
    D = (25 + 3.5) times; 4
    D = 28.5 times; 4
    D = 114 km

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