A can finish a work in 15 days and B can do the same work in twice the time taken by A. then, working together, what part of the same work they can finish in five days?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. 1/2
A’s time = 15 days, B’s time = 30 days
LCM of 15 & 30 = 30 units (total work)
A’s 1-days work = 2 units, B’s = 1 unit
Together = 3 units/day
In 5 days: 3 × 5 = 15 units
Part of work = 15/30 = 1/2