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A person travels along a straight road f...

A person travels along a straight road for the first `((1)/(4))^`th`` time with speed `v_(1)` and for next `((3)/(4))^`th`` time with a speed `v_(2)`.The average speed of the person will be
(A) `(v_(1)+v_(2))/(2)`
(B)`(v_(1)+v_(2))/(3)`
(C)`(v_(1)+3v_(2))/(4)`
(D) `v_1+v_2`

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