A and B can do a work in 10 days and 15 days respectively. A starts the work and B joins him after 2 days. In how many days can they complete the remaining work? Answers:
A) 6 days
B) 2 days
C) 4 4/5 days
D) 3 days
E) 9 days
Work done by A in 2 days = 2/10 = 1/5   Remaining work = 4/5   Work done by both A and B in one day = 1/10 + 1/15 = 5/30 = 1/6   Remaining work = 4/5 * 6/1 = 24/5 = 4 4/5 days.   Answer: 4 4/5 days
<result>C</result>
A and B can do a work in 10 days and 15 days respectively. A starts the work and B joins him after 2 days. In how many days can they complete the remaining work?