Question

A and B can do a work in 15 days and 20 days respectively. In how many days will the work be completed if they work together?

Please help me to solve this

Answer 1

Answer:

Hey mate. Here is your solution: 60/7 days .

Step-by-step explanation:

A can do the work in 15 days.

Therefore in one day he does

$\frac{1}{15}$

th of the work.

Similarly B does

$\frac{1}{20}$

th of the work.

Together they do

$\frac{1}{15} + \frac{1}{20} = \frac{7}{60}$

th of the work.

Hence they take 60/7 days to complete the work.

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