1.

If a car covers 2/5th of the total distance with v_1 speed and 3/5th distance with v_2 then average speed is

Answer»

`1/2 sqrt(v_(1)v_(2))`
`(v_(1)+v_(2))/(2)`
`(2v_(1)v_(2))/(v_(1)+v_(2))`
`(5v_(1)v_(2))/(3v_(1)+2v_(2))`

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