A is 40% more efficient than B. How much time will they take to work together to complete a job, which A alone could have done in 31 days?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. days.
Let the amount of work completed by B in 1 day be 5 units
Since A is 40% more efficient than B, the amount of work completed by A in 1 day = 1.4 × 5 = 7 units
A can alone complete the work in 31 days
⇒ Total work = 31 × 7 = 217 units
Hence the time taken to complete 217 units by both of them working together = days