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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.
Answer & Solution
Correct Answer:
Option
B
$$\eqalign{
& {\text{Average speed}} = \frac{{96 + 124 + 105}}{{\frac{{96}}{{16}} + \frac{{124}}{{31}} + \frac{{105}}{7}}} \cr
& = \frac{{325}}{{6 + 4 + 15}} \cr
& = \frac{{325}}{{25}} \cr
& = 13{\text{ kmph}} \cr} $$
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