A and B can do a work together in 18 days. A is three times as efficient as B. In how many days can B alone complete the work?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 72 days
The ratio of the efficiency of A and B = 3 : 1
let the efficiency of of A and B be 3x and x
A and B complete the whole work in 18 days.
Total work = 4x × 18 = 72x units.
Time taken by B to complete the work = 72x/x = 72 days.