Question : A man goes from A to B at a speed of 200 km/hr and comes back to A at a speed of 300 km/hr. Find his average speed for the entire journey.
Option 1: 264 km/hr
Option 2: 345 km/hr
Option 3: 340 km/hr
Option 4: 240 km/hr
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Correct Answer: 240 km/hr
Solution : $S_1$ = 200 km/hr $S_2$ = 300 km/hr Average speed = $\frac{2S_1S_2}{S_1+S_2}$ = $\frac{2×200×300}{200+300}$ = $\frac{120000}{500}$ = $240$ km/hr Hence, the correct answer is 240 km/hr.
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