Question : A person goes from point A to B with a speed of 55 km/hr and returns with a speed of 65 km/hr. What is the average speed (in km/hr) of the person while going and coming back from A to B?
Option 1: 59.58
Option 2: 62.31
Option 3: 60
Option 4: 63
Correct Answer: 59.58
Solution :
Average speed for the same distance
= $\frac{\text{2ab}}{{\text{a+b}}}$, where a and b are the speeds
= $\frac{2\times 55 \times 65}{55+65}$
= $ \frac{2\times 55\times 65}{120}$
= $59.58$
Hence, the correct answer is 59.58 km/hr.
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