Multiple choice

B starts 4.5 minutes after A from the same point, for a place which is at a distance of 3.5 miles from the starting point. A, on reaching the destination, turns back and walks a mile, where he meets B. If A's speed is a mile in 6 minutes, then B's speed is a mile in ____ minutes.

  1. 8

  2. 10

  3. 12

  4. 9
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A's speed is 1 mile/6 min = 10 mph. B starts 4.5 min late. A travels 3.5 miles, turns back 1 mile, so A travels 4.5 miles total in 4.5 * 6 = 27 minutes. B has been traveling for 27 - 4.5 = 22.5 minutes. B traveled 3.5 - 1 = 2.5 miles. B's speed = 2.5 miles / 22.5 min = 1 mile / 9 minutes.

Keep practicing — related questions