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A car covers the first-half of the dista...

A car covers the first-half of the distance between two places at `40 km//h` and other half at `60 km//h`. The average speed of the car is

Text Solution

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Time taken by car to go from A to B =`t_1=(AB)/60` hr
Time taken by car to come back from B to A = `(AB)/40`
Total time taken = `t_1+t_2`
`=(AB)/60+(AB)/40`
`=(2AB+3AB)/120`
`=(5AB)/120` hrs
Average speed = `"Total distance"/"Total time"`
`=(2AB)/(5AB)xx120` = 48 km/hr
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