A and B can do a work in 18 and 24 days respectively. They worked together for 8 days and then A left. The remaining work was finished by B in:
Answer: A
LCM of 18 and 24 is 72. Total work = 72 units. A's rate=4, B's rate=3 units/day. Work done in 8 days together = \((4+3) \times 8 = 56\) units. Remaining work = 72 - 56 = 16 units. Time for B to finish this = 16 / 3 = 5 1/3 days.