Prakash can do a job in 15 days. In how many days can Prakash and Jayesh together complete the job, if Jayesh is twice as fast as Prakash?
Show answer & explanation
Correct answer: B
Explanation
Prakash's rate = 1/15
Jayesh's rate = 2/15
Combined rate = 1/15 + 2/15 = 3/15 = 1/5
Time = 1 / (1/5) = 5 days