Madhur works 2 times faster than Sagar. If Sagar can complete a job alone in 18 days, then in how many days can they together finish the job?
Let total work to be done = 18 units
Sagar's efficiency = $$\frac{18}{18} = 1$$ units/day
Madhur works 2 times faster than Sagar, => Madhur's efficiency = $$1 \times 2 = 2$$ units/day
Madhur and Sagar 1 day's work = 1 + 2 = 3 units/day
=> Time taken by them to finish the work together = $$\frac{18}{3} = 6$$ days
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