Multiple Choice Questions on A car covers from successive three km stretches at speed of 10 km hr 20 km hr 30 km hr and 60 km hr ........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

A car covers from successive three km stretches at speed of 10 km hr 20 km hr 30 km hr and 60 km hr ...........

Quantitative Aptitude ( CCS) Time & distance
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    A car covers from successive three km stretches at speed of 10 km/hr, 20 km/hr, 30 km/hr and 60 km/hr respectively. Its average speed over this distance is

    10 km/hr

    Incorrect Answer

    20 km/hr

    Correct Answer

    30 km/hr

    Incorrect Answer

    25 km/hr

    Incorrect Answer
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    Explanation:

    Let total distance = 4×3 = 12 km
    Total time taken 
    =3/10 + 3/20 + 3/30 + 3/60 = 18+9+6+3/60 

    = 36/60 = 3/5
    Average speed = 12/(3/5) = 12 × 5/3 = 20 km/hr

    Hence, option 2 is the correct answer.

    By: Amit Kumar
    ProfileResources

    Let's Discuss

    Hemlata

    in spite of from it should be four.

    0 0 reply

    sunny bhonsle

    answer is right

     0 0 reply
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