1.

A car covers the first half of the distance between two places at a speed of `40 kmh^(-1)` and second half at `60 kmh^(-1)` Calculate the average speed of the car.

Answer» Given, speed in first half, `v_(1)=40 kmh^(-1)`.
Speed in second half, `v_(2) = 60 kmh^(-1)`.
`because` Car covers equal distance with different speeds.
`therefore` Average speed of car
`v_(av)=(2v_(1)v_(2))/(v_(1)+v_(2))`
`v_(av)=(2(40) (60))/(40+60)=48 kmh^(-1)`


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