A does a work in 15 days and B does the same work in 30 days. In how many days they together will do the same work ? Pick one
A) 5 days
B) 6 days
C) 8 days
D) 10 days
E) None of these
Explanation:   Firstly we will find 1 day work of both A and B, then by adding we can get collective days for them,   So,   A's 1 day work = 1/15   B's 1 day work = 1/30   (A+B)'s 1 day work =   (1/15+1/30)=1/10   So together they can complete work in 10 days.   Answer: 10 days
<result>D</result>
A does a work in 15 days and B does the same work in 30 days. In how many days they together will do the same work ?