A car travels from A to B at V(1) km./hr...

A car travels from A to B at `V_(1)` km./hr, travels from B to A at `V_(2)` km/hr and again A to B at `V_(2)` km/hr. Find average speed of car ?

`(2V_(1)V_(2))/(V_(1) + 2V_(2))`

`(2V_(1)V_(2))/(V_(2) + 2V_(1))`

`(3V_(1)V_(2))/(V_(2) + 2V_(1))`

`(3V_(1) V_(2))/(V_(1) + 2 V_(2))`

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