Question

A car is moving on the straight road and covered one fourth part with 36m/s and rest with 54m/s. find the average speed. (a) 11/3 m/s (b) 40/3 m/s (c) 27 m/s (d) 18 m/s​

Answer 1

velocity of 1/3 distance =36 m/s

velocity of remaining(2/3)=54 m/s

let total distance =d/3

so time will be  for 1/3- $\frac{d/3}{36}$

time for 2/3=$\frac{2d/3}{54}$

average speed= total distance /total time

=$\frac{d}{\frac{d/3}{36}+\frac{2d/3}{54}}$

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