1/9 + 1/5 = 14/45 reports per hour is the combined speed
To write one report, 45/14 h is required.
That is 3 3/14 hours, or 3 h 13 min
jon can type a report in 9 hours, nick can do the same job in 5 hours. How long would it take to type if they did it together?
1 answer