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
Answer (1)
25th Jan, 2024
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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