A car covers `(1)/(3)` part of total distance with a speed of `20 km hr^-1` and second `(1)/(3)` part with a speed of `30 km hr^-1` and the last `(1)/(3)` part with a speed of `60 km hr^-1`. The average speed of the car is.

Options

A. `55 kmhr^-1`
B. `30 kmhr^-1`
C. `45 kmhr^-1`
D. `37.3 kmhr^-1`

Answer

B