Let total work to be done = 18 units Sagar's efficiency =
18
18
= 1units/day Madhur works 2 times faster than Sagar, ⇒ Madhur's efficiency = 1× 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 =