Question

2. (3) One day's work by ( A ) and ( B=frac{1}{10} ) and One day's work y by ( A ) alone ( =frac{1}{30} )
( therefore ) One day's work by ( B ) alone
[
begin{array}{l}
=frac{1}{10}-frac{1}{30}=frac{3-1}{30}
=frac{2}{30}=frac{1}{15}
end{array}
]
Hence, ( B ) will complete the work in 15 days.

# 2. A and B together can do a piece of work in 10 days. A alone can do it in 30 days. The time in which B alone can do it is (1) 10 days (2) 12 days (3) 15 days (4) 20 days

Solution