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

    Question

    The ratio of the speed of boat ‘A’ in still water,

    the speed of boat ‘B’ in still water and the speed of the current is 8:5:2, respectively. If the time taken by boat ‘A’ to travel (5D – 50) km downstream is equal to the time taken by boat ‘B’ to travel (D + 55) km upstream, then find the value of ‘D’.
    A 100 Correct Answer Incorrect Answer
    B 120 Correct Answer Incorrect Answer
    C 140 Correct Answer Incorrect Answer
    D 130 Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    Let, the speeds of boat ‘A’ and boat ‘B’, in still water and the speed of the current be 8x km/hr, 5x km/hr and 2x km/hr, respectively. According to the question, (5D – 50)/(8x + 2x) = (D + 55)/(5x – 2x) Or, 15D – 150 = 10D + 550 Or, 5D = 800 Or, D = 140

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