Multiple choice

A works 3 times as fast as B if B Completes work in 60 days, together they complete the same work?

  1. 12

  2. 15

  3. 18

  4. None
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

B takes 60 days. A is 3 times as fast, so A takes 20 days. Together, they take (20 * 60) / (20 + 60) = 1200 / 80 = 15 days.

AI explanation

Since A works 3 times as fast as B and B takes 60 days, A takes 60 / 3 = 20 days to complete the work alone. Using the combined work formula, time equals the product of their times divided by their sum, giving (20 * 60) / (20 + 60). This results in 1200 / 80, which equals 15 days.

Keep practicing — related questions