Question : A girl goes from M to N at a speed of 25 km/hr and returns to M at a speed of 37.5 km/hr, via the same route. What is the girl's average speed (in km/hr)?
Option 1: 30
Option 2: 32
Option 3: 31.25
Option 4: 27.5
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Correct Answer: 30
Solution : Given: $s_1$ = 25 km/hr $s_2$ = 37.5 km/hr Using the average speed formula Average speed = $\frac{2 {s_1}{s_2}}{s_1 + s_2}=\frac{2\times 25\times 37.5}{25+37.5} = 30$ km/hr Hence, the correct answer is 30.
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