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    Question

    Find the average speed of boat A to cover the given

    distance if the speed of boat A in still water is 20km/hr?
    A 18.75km/hr Correct Answer Incorrect Answer
    B 16.66 km/hr Correct Answer Incorrect Answer
    C 19.74 km/hr Correct Answer Incorrect Answer
    D 35.75 km/hr Correct Answer Incorrect Answer
    E None of the above Correct Answer Incorrect Answer

    Solution

    Total distance travelled by boat A = 50kms Speed of stream = 5 km/hr Speed of boat A in still water = 20 km/hr Upstream speed = 15 km/hr Downstream speed = 25 km/hr Upstream distance = 40% of 50 kms = 20 kms Downstream distance = 50 kms – 20 kms = 30kms   Time taken to travel upstream = km/hr = km/hr Time taken to travel downstream = km/hr = km/hr Average speed = = = 19.74 km/hr Hence, option 3 is the correct answer

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