Multiple choice

Roger and Rafael run towards each other at the speeds of 20 m/s and 16 m/s respectively. After how much time will they meet if the initial distance between them is 720m?

  1. 30 s

  2. 20 s

  3. 25 s

  4. 180 s
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Relative speed = 20 + 16 = 36 m/s. Time = Distance / Relative Speed = 720 / 36 = 20 seconds.

AI explanation

Since they run towards each other, their relative speed is the sum of their speeds, which is 20 m/s plus 16 m/s, giving 36 m/s. The time taken to meet is the total distance divided by the relative speed, so 720 m divided by 36 m/s equals 20 seconds. They will meet after 20 seconds.

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