A and B together can fill a ditch in 30 days while A alone can fill it in 50 days. If B does the work for only half a day daily, how long will it take to fill the ditch by A and B?
Q1. A and B together can fill a ditch in 30 days while A alone can fill it in 50 days. If B does the work for only half a day daily, how long will it take to fill the ditch by A and B?
Answer: 75/2 days
Explanation: B's full-day rate = 1/75; with half a day B contributes 1/150, combined with A's 1/50 = 3/150 gives 4/150 per day, taking 75/2 days.