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    				| 1. | Ravi can do a piece of work in 15 hours while Raman can do it in 12 hours. How long will both take to do it, working together? | 
| Answer» we know that, Number of hours Ravi required to do piece of work = 15 hours Number of hours Raman required to do piece of work = 12 hours ∴ We can calculate, work done by Ravi in 1 day = 1/15 Work done by Raman in 1 day = 1/12 Now, work done by both Ravi and Raman together in 1 hour= 1/15 + 1/12 = 9/60 = 3/20 ∴ They can do work together in 20/3 hours = 6 2/3 hours = 6 hours 40 minutes | |