A and B can do a piece of work in 16 days and 12 days, respectively. Both work for 4 days and then A goes away. Find how long will B take to complete the remaining work.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 5 days.
Combined work rate = (1/16 + 1/12) = 7/48 per day
Work done in 4 days = 4 × 7/48 = 7/12
Remaining work = 1 - 7/12 = 5/12
Time for B to complete the remaining work = (5/12)/(1/12) = 5 days