Mohan takes 9 hours to mow a large lawn. He and Sohan together can mow in4 hours. How long will Sohan take to mow the lawn if he works alone?
Given,
Mohan can mow a lawn in 9 hours.
Work done by Mohan in 1 hour =
Mohan and Sohan can mow it together in = 4 hours
Work done by them together in 1 hour =
Work done by Sohan in 1 hour = (work done by both in 1 hour) – (work done by Mohan in 1 hr)
∴ Time taken by Sohan to complete the work =