Mr. sharrone can paper a room in 3 hours. his assistant needs 5 hours. if mr. sharrone works 1 hour and then his assistant completes the job alone, how long will it take the assistant to finish the job?

Mr Sharrone can do 1/3 of the job each hour

the assistant does 1/5 of the job each hour

1 (1/3) + H (1/5) = 1 (complete job)

1/3 + 1/5 H = 1

1/5 H = 1 - 1/3 = 2/3

H = (2/3) / (1/5) = 10/3 = 3 1/3 hours to complete the job