2. A and B together can do a piece ...
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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

11th - 12th Class
Maths
Solution
113
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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.
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