1.

An object moves first half of the total distance with the speed of 40km/h in a straight line. Find it's constant speed for the second half of the total distance if the average speed of entire trip is 60km/h

Answer»

By FORMULA.
av.speed =  \frac{2 \times v1 \times v2}{v1 + v2}
60=(2 X 40 x v2) / 40 +x



X=120kmph



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