A person travels along a straight road d...

A person travels along a straight road due east for the first half distance with speed `v_1` and the second half distance with speed `v_2`, the average speed of the person is

`(v_1+v_2)/2`

`v_1/2 + v_2/2`

`(v_1+v_2)/2v_1 v_2`

`2v_1 v_2(v_1+v_2)`

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