Multiple choice

A and B start walking towards the same direction on a 16 km. long road at the speed of 7 km./hr. and 5 km./hr. respectively distance between starting point of A and B is 1 km. How far minimum apart may they be after 2 hours?

  1. 3 km.

  2. 4 km.

  3. 5 km.

  4. Cannot be determined
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

After 2 hours, A travels 14 km and B travels 10 km. The minimum distance occurs when A starts behind B. In this case, A's position is 14 km from his start and B's position is 11 km from A's start (10 km from B's start + 1 km initial gap). The distance between them is 14 - 11 = 3 km.

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