Question : A man goes from place A to B at a speed of 12 km/hr and returns from B to A at a speed of 18 km/hr. His average speed for the entire journey is:
Option 1: $14 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$
Option 2: 15 km/hr
Option 3: 6 km/hr
Option 4: 30 km/hr

Question

Question : A man goes from place A to B at a speed of 12 km/hr and returns from B to A at a speed of 18 km/hr. His average speed for the entire journey is:

Option 1: $14 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$

Option 2: 15 km/hr

Option 3: 6 km/hr

Option 4: 30 km/hr

Team Careers360 · Accepted Answer

Correct Answer: $14 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$

Solution : Given: A man goes from place A to B at a speed of 12 km/hr and returns from B to A at a speed of 18 km/hr.
$ herefore$ Average speed = $\frac{ ext{2 × (Speed to go to A to B) × (Speed to go to B to A)}}{ ext{(Speed to go to A to B) + (Speed to go to B to A)}}$ = $\frac{2×12×18}{12+18}=14 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$
Hence, the correct answer is $14 \frac{2}{5} \mathrm{~km}/\mathrm{hr}$.

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Question : A man goes from place A to B at a speed of 12 km/hr and returns from B to A at a speed of 18 km/hr. His average speed for the entire journey is:Option 1: 1425 km/hrOption 2: 15 km/hrOption 3: 6 km/hrOption 4: 30 km/hr

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Question : A man goes from place A to B at a speed of 12 km/hr and returns from B to A at a speed of 18 km/hr. His average speed for the entire journey is:
Option 1: $14 \frac{2}{5} km / hr$
Option 2: 15 km/hr
Option 3: 6 km/hr
Option 4: 30 km/hr