Raju, Shobh and Mohan can do a work in 15 days, 20 days and 25 days respectively. In how many days, will the work be finished, if they do it on alternate days?
Answer & explanation
Correct answer: option 4
If A, B, C start working on alternate days
by considering them as a single block of eff = 47
in 6 x 3 days, work done = efficiency x no. of days
= 47 x 6
= 282
Remaining work = 300 - 282 = 18
This will take A = \(\frac{18}{20}\) = \(\frac{9}{10}\) days
Total time taken to finish the complete work = 18\(\frac{9}{10}\) days