A can do a work in 60 days. He works for 15 days and later B alone completes the work in 30 days. In what time will they together complete the work?  Select the correct option
A) 24 days B) 25 days C) 30 days D) 32 days E) None of these
let A can do a work in = 1/60 days   he does 15 days so work done by A in 15 days= (15) * (1/60) = 1/4   remaining work is = 1- 1/4= 3/4   B's one day work is =1/30   so 3/4 work is done by B in=(3/4) * (1/30) = 1/40 days   time require to complete the work is= 1/60 + 1/40 = 5/120   5/120 = 1/24   so 24 days require to complete the work together.   24 daysNSWER:24 days
<result>A</result>
A can do a work in 60 days. He works for 15 days and later B alone completes the work in 30 days. In what time will they together complete the work?