A can lay a railway track between two given stations in 16 days and B can do the

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A can lay a railway track between two given stations in 16 days and B can do the same job in 12 days. With help of C, they did the job in 4 days only. Then, C alone can do the job in_________?

Options:

A . 4

B . 9.6

C . 9

D . 10

Answer: Option B
PART OF WORK COMPLETED BY A AND B IN 4 DAYS
= 4*((1/16) + (1/12))
= 7/12 C CAN COMPLETE 5/12TH OF THE WORK IN 4 DAYS C CAN COMPLETE THE WHOLE JOB IN
4÷(5/12) = 9.6 DAYS

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