A person travels along straight road for first t/3 time with speed V1 and for next 2t/3 time with speed V2. Then average velocity(V) of person was
(1) V = V1+2V2/3
(2) 1/v = 1/3V1+2/3V2
(3) V = 1/3* square root (2V1V2)
(4) V = square root (3V2/2V1)
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