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A man travels 50 km at speed 25 km/hr and next 40 km at 20 km/hr and there after travel 90 km at 15 km/hr. His average speed is :
Answer & Solution
Correct Answer:
Option
A
$$\eqalign{
& {\text{Average speed :}} \cr
& = \frac{{{\text{Total distance }}}}{{{\text{Total time}}}} \cr
& = \frac{50 + 40 + 90}{2 + 2 + 6} \cr
& = \frac{180}{10} \cr
& = 18{\text{ km/hr}} }$$
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