Prasad goes 96 kilometres on a bike at a speed of 16 km/h, 124 kilometres at 31 km/h in a car, and 105 kilometres at 7 km/h in a horse cart. Find his average speed for the entire distance travelled.

A. 16 km/h

B. 13 km/h

C. 17 km/h

D. 11 km/h

Answer: Option B

Solution(By Examveda Team)

$$\eqalign{ & {\text{Average speed}} = \frac{{96 + 124 + 105}}{{\frac{{96}}{{16}} + \frac{{124}}{{31}} + \frac{{105}}{7}}} \cr & = \frac{{325}}{{6 + 4 + 15}} \cr & = \frac{{325}}{{25}} \cr & = 13{\text{ kmph}} \cr} $$