A can do a work in 40days, B in 60days. A alone start the work after 10days he left work. In how many days B can finish the work?	Options
A) 20 days	B) 15 days	C) 30 days	D) 45 days	E) 50 days

Rationale: 10 days work of a = 10 / 40 = 1 / 4 remaining work = 1 - 1 / 4 = 3 / 4 b can finish 3 / 4 work = 60 * 3 / 4 = 45 days answer is d
Answer: D