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?

Using the work efficiency method, if Sagar takes 18 days, Madhur who is twice as fast will take 9 days. Taking the least common multiple of 18 and 9 as the total work gives 18 units, making Sagar's efficiency 1 unit per day and Madhur's efficiency 2 units per day. Their combined efficiency is 3 units per day, so dividing the 18 units of work by 3 gives 6 days. They together finish the job in 6 days.

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