A can finish a task in 10 days and B in 15 days. How many days will they take working together?
Q1. A can finish a task in 10 days and B in 15 days. How many days will they take working together?
Answer: 6 days
Explanation: A does 1/10 and B does 1/15 per day. Together they do 1/6 per day, so the work finishes in 6 days.