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    Question

    A motor car travels a distance of 180 km at the speed of

    20 kmph. If it covers the next 100 km of its journey at the speed of 20 kmph and last 40 km of its journey at the speed of 20 kmph. What is the average speed of the car? 
    A 30 kmph Correct Answer Incorrect Answer
    B 40 kmph Correct Answer Incorrect Answer
    C 50kmph Correct Answer Incorrect Answer
    D 20 kmph Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    D 1= 180 Km, S1= 20 Km/hr, D2= 100 Km, S2 = 20 Km/hr, D3= 40 Km, S3= 20 km/hr. T1= 180/20= 9 hr. T2 = 100/20= 5 hr. T3= 40/20=2 hr. Average Speed = 320/16=20 km/hr.

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