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

    Question

    A boat travels 315 km downstream

    in 7 hours and 135 km upstream in 9 hours. Determine the total time the boat takes to cover 150 km upstream and 120 km in still water.
    A 10 hrs Correct Answer Incorrect Answer
    B 24 hrs Correct Answer Incorrect Answer
    C 18 hrs Correct Answer Incorrect Answer
    D 14 hrs Correct Answer Incorrect Answer
    E None of these Correct Answer Incorrect Answer

    Solution

    ATQ, Downstream speed of the boat = 315/7 = 45 km/hr Upstream speed of the boat = 135/9 = 15 km/hr Speed of the boat in still water = (45 + 15)/2 = 60/2 = 30 km/hr Required Sum = (150/15) + (120/30) = 10 + 4 = 14 hours

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