Multiple choice

A dog is 100 m away from a man. Suddenly, the dog starts running towards him and the man starts running away from the dog. If the speeds of the dog and the man are 5 m/s and 3 m/s, respectively, then what will be the distance between them after 10 seconds?

  1. 70 m

  2. 75 m

  3. 80 m

  4. 85 m

  5. 90 m
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The man and dog are moving in the same direction. The relative speed is 5 - 3 = 2 m/s. In 10 seconds, the dog covers 50 m and the man covers 30 m. The initial distance is 100 m. The new distance = 100 - (50 - 30) = 100 - 20 = 80 m.

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