1.

A car covers (1)/(3)part of total distance with a speed of 20 km h^(-1) and second 1 /3and the last part with a speed of 60 km h^(1) The average speed of the car is:

Answer»

55 km `h^(-1)`
37.3km `h^(-1)`
30km `h^(-1)`
45KM `h^(-1)`

Solution :Using `(3)/(V_(AV))=(1)/(v_(1))+(1)/(V_2)+(1)/(V_3)`
gives `v_(av) =30 km h^(-1)`


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