Question

A car traveling 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 car?

Answer 1

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Answer 2

It would take 1.5 minutes to catch the second car.

• A car is travelling at a speed of 90 km/hr.
• A second car is travelling at a speed of 70 km/hr.
• Now the first car is 500 m behind the second car.
• We have to find the time required by the first car to catch the second car.
• Distance between both the cars is 500 m that is 0.5 km
• Now relative speed of the cars is Speed of car 1 - Speed of car 1 = 90 - 70 = 20 km/hr.
• Now , we know that

Speed = Distance / Time

Time = Distance / Speed

Time =  0.5 / 20 = 0.025 hr

• Time in minutes = 0.025 × 60 = 1.5 minutes = 90 sec
• It would take 90 seconds to satch the second car travelling 500 m ahead of first car.