A and B together can complete a piece of work in 10days. If A alone can complete the same work in 15days, in how many days, in how many days can B alone complete that work? Choices
A) 10	B) 30	C) 25	D) 15	E) 45
(A+B)'s 1day's work = 1/10   A's 1day's work = 1/15   B's 1days's work = (1/10)-(1/15) = 1/30   Hence, B alone can complete the work in 30days.   Answer is 30
<result>B</result>
A and B together can complete a piece of work in 10days. If A alone can complete the same work in 15days, in how many days, in how many days can B alone complete that work?