A person travels along a straight road for the first `(t)/(3)` time with a speed `v_(1)` and for next `(2t)/(3)` time with a speed `v_(2)`. Then the mean speed v is given by

A person travels along a straight road for the first half with a velocity v_(1) and the second half time with a velocity v_(2) . Then the mean velocity vecv is given by

A person travels along a straight road for the half time with a velocity V_1 and the next half time with a velocity V_2 . The mean velocity V of the man is

A person travels along a straight road for the half time with a velocity V_1 and the next half time with a velocity V_2 . The mean velocity V of the man is

A person travels along a straight road for the first half length with a constant speed v_(1) and the second half length with a constant speed v_(2) . The average speed V is:

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

A girl 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) . What is the average speed of the girl ?