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stne
Can not we say that because average speed for the trip is given whereas in reality the actual speed could be anything , so we can not find the amount of time taken to travel ?
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stne
Can not we say that because average speed for the trip is given whereas in reality the actual speed could be anything , so we can not find the amount of time taken to travel ?
No you cannot say that.

It is average speed and not approximate speed or speculative speed

Avg speed = Total distance / Total time.

Hence avg speed is well defined.

Speed does vary throughout a journey. But you are interested only in: Total distance / total time.

Hence B is SUFF.

Hope it helped.
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