 
                 
                InterviewSolution
 Saved Bookmarks
    				| 1. | Mohan takes 9 hours to mow a large lawn. He and Sohan together can mow in 4 hours. How long will Sohan take to mow the lawn if he works alone? | 
| Answer» The given details are, Mohan can mow a lawn in 9 hours. Work done by Mohan in 1 hour = 1/9 Mohan and Sohan can mow the lawn together in = 4 hours Work done by Mohan and Sohan together in 1 hour = 1/4 We know that, Work done by Sohan in 1 hour = (work done by together in 1 hour) – (work done by Mohan in 1 hr) = 1/4 – 1/9 = (9-4)/36 (by taking LCM for 4 and 9 which is 36) = 5/36 ∴ Time taken by Sohan to complete the work = 1/(5/36) = 36/5hours. | |