A) 48 kmph
B) 54 kmph
C) 72 kmph
D) 94 kmph
Correct Answer: A
Solution :
We know that the average speed is \[\frac{2pq}{p+q},\] where p and q are the speeds in the two directions, for equal distances. \[\therefore \] Average speed \[=\frac{2(60)(40)}{(60+40)}\,=48\,kmph\]You need to login to perform this action.
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