A bus travels for a certain time .Its sp...

A bus travels for a certain time .Its speed during the first half time is `v_(1)` and that during the second half time is `v_(2)` . The average speed during the whole journey is :

`sqrt(v_(1)v_(2))`

`(2v_(1)v_(2))/(v_(1)+v_(2))`

`(v_(1)+v_(2))/(2)`

`(2)/(v_(1)+v_(2))`

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