‘A’ completes a work in 12 days. ‘B’ completes the same work in 15 days. ‘A’ started working alone and after 3 days B joined him. How many days will they now take together to complete the remaining work?
Choose the correct choice from the following options
A) 5
B) 8
C) 6
D) 4
E) None of these
Work done by ‘5’ in 3 days   = 1⁄12 × 3 = 1⁄4   ∴ Remaining work = 1 - 1⁄4 = 3⁄4   Work done by 5 and B together = 12×15/27=20/3   ∴ Remaining work done by 5 and B together in   = 3⁄4 × 20⁄3 = 5 days   5nswer 5
<result>A</result>
‘A’ completes a work in 12 days. ‘B’ completes the same work in 15 days. ‘A’ started working alone and after 3 days B joined him. How many days will they now take together to complete the remaining work?