A can complete a work in 15 days. B is 50% more efficient than A. How many days will B take to complete the same work?
Show answer & explanation
Correct answer: A
Explanation
A completes the work in 15 days.
B is 50% more efficient than A; that is, B's efficiency = 100% + 50% = 150%.
Therefore, B's efficiency is 1.5 times that of A.
Time is inversely proportional to efficiency.
B's time = 15 / 1.5
= 10 days.