Question

I. By working together, A and B can finish a work in 15 days. If B alone can finish the work in 20 days, in how many days can A alone finish the work?
​

Answer 1

Answer:

60

Step-by-step explanation:

A and B complete a work in = 15 days

One day's work of (A + B) = 1/15

B complete the work in = 20 days;

One day's work of B = 1/20

Then, A's one day's work

= 1/15 - 1/20 = 1/60

Thus, A can complete the work in = 60 days.