Problem: A man walking non-stop along a road at 3 km per hour is overtaken by a car running at 30 km/ h. If the car breaks down 1 Km beyond where it passes the man, how many minutes after the breakdown does the man reach the car?
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Correct Answer: 18 minutes
Explanation:
For 30 km the car takes = 60 minutes
For 1 km the car takes =$\frac{60}{30}$minutes
= 2 minutes
Again, For 3 Km the man takes = 60 minutes
For 1 km the car takes = $\frac{60}{3}$ minutes
= 20 minutes
The man reaches the car after (20 — 2) = 18 minutes