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

Question

Question : If a man goes from place A to B at a speed of 12 km/hr and return at a speed of 18 km/hr, then the average speed for the whole journey is:

Option 1: $6 \mathrm{~km} / \mathrm{hr}$

Option 2: $30 \mathrm{~km} / \mathrm{hr}$

Option 3: $14 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$

Option 4: $15 \mathrm{~km} / \mathrm{hr}$

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 at a speed of 18 km/hr.
We know that,
Average speed = $\frac{2 imes12 imes18}{12+18}$ = $\frac{2 imes12 imes18}{30}$ = $\frac{72}{5}$ = $14 \frac{2}{5}$
Hence, the correct answer is $14 \frac{2}{5} \mathrm{~km} / \mathrm{hr}$.

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Question : If a man goes from place A to B at a speed of 12 km/hr and return at a speed of 18 km/hr, then the average speed for the whole journey is:Option 1: 6 km/hrOption 2: 30 km/hrOption 3: 1425 km/hrOption 4: 15 km/hr

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