A and B can do a work in 10 days and 15 days respectively. A starts the work and B joins him after 3 days. In how many days can they complete the remaining work? Options:	A) 6 days	B) 2 days	C) 8 days	D) 4 1/5 days	E) 9 days
Work done by A in 3 days = 3/10   Remaining work = 7/10   Work done by both A and B in one day = 1/10 + 1/15 = 5/30 = 1/6   Remaining work = 7/10 * 6/1 = 21/5 = 4 1/5 days.   Answer: 4 1/5 days
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A and B can do a work in 10 days and 15 days respectively. A starts the work and B joins him after 3 days. In how many days can they complete the remaining work?