X does a work in 30 days. Y does the same work in 45 days. In how many days they together will do the same work?	Choose the correct choice from the following choices.
A) 18 B) 12 C) 20 D) 30 E) 15
X's 1day's work= 1/30   Y's 1 day's work=1/45   (X+Y)'s 1day's work= (1/30+1/45)=1/18   both together will finish the work in 18 days.   correct option is 18
<result>A</result>
X does a work in 30 days. Y does the same work in 45 days. In how many days they together will do the same work?