Multiple choice

Two cars start at the same time from the same location and go in the same direction. The speed of the first car is 50 km/h and the speed of the second car is 60 km/h. The number of hours it takes for the distance between the two cars to be 20 km is ____________.

  1. 1

  2. 2

  3. 3

  4. 6
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B Correct answer
Explanation

Relative speed = 60 - 50 = 10 km/h. Time = Distance / Relative Speed = 20 km / 10 km/h = 2 hours.

AI explanation

The relative speed of the two cars moving in the same direction is the difference between their speeds, calculated as 60 minus 50, which equals 10 km per hour. Using the formula time equals distance divided by speed, the time required to create a 20 km gap is 20 divided by 10. The result is 2 hours.

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