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

Explanation

Let's calculate their combined work rate:

Ali's rate = 1 work / 4 days = 1/4 work per day

Hyder's rate = 1 work / 12 days = 1/12 work per day

Combined rate = 1/4 + 1/12

= 3/12 + 1/12

= 4/12

= 1/3 work per day

Time to complete the work together = 1 / (1/3)

= 3 days