Question

12. A car travelling at 90 km/h is 500 m behind another car travelling at

70 km/h in the same direction. How long will it take the first car to
catch the second?​

Answer 1

1.5 minutes.

Explanation:

The relative speed at which the car behind travels compared to the other car is 90 - 70 = 20 km/hr.

The time taken to travel 500 m ( =0.5 km) is 0.5 / 20 = 0.025 hours.

= 0.025 * 60 = 1.5 minutes.