Question

3. A and B together can do a piece of work in 35 days, while A alone can do it in 60 days. How long
would B alone take to do it?​

Answer 1

Step-by-step explanation:

A+B = 35 days

in one day = 1 ÷ 35

A alone = 60 days 

1 day = 1÷60

then B = ( 1÷35) - (1÷60)

= 12 - 7 ÷ 420

= 5 ÷ 420

=1 ÷ 84 

thus B= 84 days