Question

an experience plumber working alone can complete the plumbing work of a hostel block in 9 days and apprentice would take 18 days for the same job as the work has to be completed fast to two plumbers and to apprentices are engaged how many days would it take to complete the work?
1)3
2)4
3) 4.5
4)6
​

Answer 1

Step by Step answer :

If 1 plumber completes a work in 9 days

1 days work = 1/9 completed

If 2 apprentices completes a work in 18 days

days1 days work = 1/18 completed

Therefore,

2 plumbers and 2 apprentices have 1 days work =

1/9+1/9+1/18+1/18

= 6/18 = 1/3

So, 2 plumbers and 2 apprentices can complete the whole work in 3 days .

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