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A vehicle travels half the distance L wi...

A vehicle travels half the distance L with speed `V_1` and the other half with dspeed `v_2`, then its average speed is

A

`(v_1 +v_2)/(2)`

B

`(2v_1+v_2)/(v_1+v_2)`

C

`(2v_1v_2)/(v_1+v_2)`

D

`(L(v_1v_2))/(v_1v_2)`

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