A and B can do a job in 6 days. A alone can do it in 10 days. In how many days can B do it alone?
Show answer & explanation
Correct answer: D
Explanation
A + B = 6 days, A = 10 days
A + B = 1/6
A = 1/10
B = 1/6 − 1/10
= (5 − 3) / 30
= 2/30
= 1/15
Time = 15 days