Raju can do a piece of work in 10 hours, and Ram can do it in 15 hours. In how much time will they finish the whole work working together?
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 6 hours
Given that
Raju can do a piece of work in 10 hours
Ram can do the same piece of work in 15 hours
Total work = LCM (10, 15) = 30
The efficiency of Raju = 30/10 = 3
The efficiency of Ram = 30/15 = 2
Hence, they will finish the whole work working together: 30/(3 + 2) = 30/5 = 6 hours