Two men start together to walk a certain distance, one at 4 km/h and another at 3 km/h. The former arrives half an hour before the latter. Find the distance.

6 km
9 km
8 km
7 km

Correct Answer: 6 km

Explanation:

Let total distance = x km
According to the question,
x/3 - x/4 = 1/2;
⇒ x/12 = 1/2
∴ x = 6 km

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