New Enroll in RBI Grade B New Batch - Starts on May 21

    Question

    A boat takes one-third time in moving a certain distance

    downstream than upstream. The ratio of the speed of the boat in still water and that of the current is
    A 4:3 Correct Answer Incorrect Answer
    B 5:2 Correct Answer Incorrect Answer
    C 2:1 Correct Answer Incorrect Answer
    D 2:3 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let the speed of boat in still water = x km/hr, and Speed of current = y km/hr Rate downstream = (x + y) km/hr, and Rate upstream = (x – y) km/hr Distance = Speed × Time ؞ (x - y) × 3t = (x + y) × t => 3x - 3y = x + y => 3x - x = 3y + y => 2x = 4y => x/y = 4/2 = 2 : 1

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