ArithmeticA car during its journey travels 30 min. at a speed of 40 kmph, another 45 min at 60 kmph and 2 hours at 70 kmph. Find its average speed. 

A car during its journey travels 30 min. at a speed of 40 kmph, another 45 min at 60 kmph and 2 hours at 70 kmph. Find its average speed. 

  1. A

    63.04 kmph

  2. B

    65 kmph 

  3. C

    68 kmph

  4. D

    63.07 kmph

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    Solution:

     Average speed=Total  distanceTotal  Time

    =12×40+34×60+2×7012+34+2

    =20+45+1402+3+84=82013=63.07kmph

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