A and B can together finish a work 30 days. They worked together for…

Question

A and B can together finish a work 30 days. They worked together for 20 days and then B left. After another 20 days, A finished the remaining work. In how many days A alone can finish the work?

Accepted Answer

Option D. 60. Answer & Solution Answer: Option D Solution: & ( A + B ) 's\, 20\, day's\, work & = 130 × 20 = 2/3 & Remaining\, work & = 1 - 2/3 = 1/3 & Now,1/3\, work\, is\, done\, by\, A\, in\, 20\, days & The\, whole\, work\, will\, be\, done\, by\, A\, in & 20 × 3 = 60\,days