Question

A can do 60% of work in 9 days. A and B can do 20% of work in 7/4 days. Find time taken by B to complete work alone.​

Answer 1

Answer:

A can do a piece of work in 7 days of 9 hr each or in 63 hrs.

B can do it in 6 days of 7 hr each or 42 hrs

So, in 1 hour, A can do 1/63 of the work and B can do 1/42 of the work.

Together, they can finish 5/126 of the work in 1 hour or they work gets completed in 126/5 hrs.

Together, they can finish 5/126 of the work in 1 hour or they work gets completed in 126/5 hrs.If they complete work in 42/5 hrs a day, they will take 3 days to complete the work working for 126/5 hours.