The distance between P and Q is 180 km. Car A starts moving from P to Q at a speed of 36 km/h, and car B starts moving from Q to P at a speed of 24 km/h. In how much time will car A cross car B?

3.5 hours
3 hours
2 hours
4 hours

Correct answer: 3 hours

Solution

Car A and car B move towards each other, so their relative speed is 36 + 24 = 60 km/h. The time taken to meet is 180/60 = 3 hours. Hence, the correct answer is 3 hours.

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