1.

If a car covers (2)/(3) of the total distance with speed nu_(1)and (3)/(5) distance with speed v, then average speed is

Answer»

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

Solution :AVERAGE speed = `("Total distance COVERED ")/("Total time taken ")`
`nu_(a)=(s)/(((2s)/5)/nu_(1)+((3s)/5)/nu_(2))IMPLIES nu_(a)=(5nu_(1)nu_(2))/(3nu_(1)+2nu_(2))`


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