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** Q 2415891760. ** A factory has three machines which can finish a lot in 3, 4 and 5 hours, respectively. Due to some power problems in the city on Tuesdays, only 2 of these machines can work simultaneously at any given point in time. What is the largest part of the job that can be finished in one hour on a Tuesday?

**IBPS-CLERK 2017 Mains **