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

    Question

    A car travels a distance of200 km at the speed of 50

    kmph. If it covers the ne×t 160 km of its journey at the speed of 80 kmph and last 80 km of its journey at the speed of 40 kmph. What is the average speed of the car?
    A 60 kmph Correct Answer Incorrect Answer
    B 55 kmph Correct Answer Incorrect Answer
    C 54 kmph Correct Answer Incorrect Answer
    D 64 kmph Correct Answer Incorrect Answer
    E none of these Correct Answer Incorrect Answer

    Solution

    D1= 200 Km, S1= 50 Km/hr, D2= 160 Km, S2 = 80 Km/hr, D3= 80 Km, S3= 40 km/hr. T1= (Distance )/Speed = (200 )/50 = 4 hr. T2 = (Distance )/Speed = (160 )/80 = 2 hr. T3= (Distance )/Speed = (80 )/40 = 2 hr. Average Speed= (Total Distance )/(Total Time) = (440 )/8 = 55 km/hr.

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