The efficiency of A, B and C is the same. They started working on a certain job. After 5 days a leaves, after 5 moere days B leaves and C completes the remaining work in 5 more days. Find the time taken by eahc of them alone to complete the job. (in days)?

Options

A. 20
B. 30
C. 40
D. 45

Answer

B

Explanation

Let us assume that each of A, B and C alone can do in x-axis 15 days
A works for 5 days, B works for 10 days and C works 15 days.
`:. (5)/(x)+(10)/(x)+(15)/(x)=1`
`(30)/(x)=1rArr=30`