Question

A is three times more efficient than b, and is therefore able to complete a work in 60 days earlier. The number of days that a and b together will take to complete the work is

Answer 1

Answer:

16 days

Step-by-step explanation:

A is three times more efficient and can complete the work 60 days earlier.

so A can do the work in 60/3 = 20 days and B can do in 20+60=80 days.

LCM of 20 and 80 is 80.

So let there be 80 work.

A does 80/20 = 4 works in a day and B does 80/80 = 1 work in a day.

Together they will do 4 + 1 = 5 works in a day.

Time required to complete the work when they work together = 80/5 = 16 days