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    Question

    A man travels some distance at a speed of 20 km/hr and

    returns at a speed of 12 km/hr. If the total time taken by him is 2 hrs 40 min, the distance is 
    A 20 km Correct Answer Incorrect Answer
    B 36 km Correct Answer Incorrect Answer
    C 15 km Correct Answer Incorrect Answer
    D 24 km Correct Answer Incorrect Answer

    Solution

    Let the distance travelled by a man be D km According to the question, Total time taken = 2 hrs 40 min = 2(40/60) = 8/3 hours Total time = T1 + T2 D/20 + D/12 = 8/3 (3D + 5D)/60 = 8/3 8D/60 = 8/3 D = 20 km 

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