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Car at 74 km/h. Bus 460m ahead at 65 km/h. In how much time will the car overtake the bus?

1. 2 min 40 sec
2. 3 min 4 sec
3. 4 min 10 sec
4. 3 min 20 sec

Correct answer: 3 min 4 sec

Solution

Relative speed=74-65=9 km/h=9000m/3600s=2.5m/s. Time to cover 460m=460/2.5=184s=3 minutes 4 seconds.

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