If Ali completes a particular work in 4 days and Bilal completes the same work in 12 days. How many days will it take if they work together?

If Ali completes a particular work in 4 days and Bilal completes the same work in 12 days. How many days will it take if they work together?

A. 3

B. 5

C. 4

D. 7

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