Question

If Bob can lay railway track between two given stations in 16 days and Joe can do the same job in 12 days. With help of Chuck, they did the job in 4 days only. Then, Chuck alone can do the job in ______

Answer 1

Let x=days take by Chuck alone to do the job
1/x=Chucks work rate
1/16=Bob's work rate
1/12=Joe's work rate
1/4=work rate when all three worked on the job

sum of individual work rates=work rate when working together
1/x+1/16+1/12=1/4
1/x=1/4-1/16-1/12=12/48-3/48-4/48=5/48
1/x=5/48
x=48/5=9.6.

Hope it's helpful to u.

Answer 2

Answer:

x=9.6

Step-by-step explanation:

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