Mr. Binns Can Clean Up The Leaves Twice As Fast As His Son. If It Took Them 4 Hours To Clean Up The Leaves, How Long Would It Take His Son To Clean Up The Leaves By Himself?

 

QUESTION 3 Mr. Binns can clean up the leaves twice as fast as his son. If it took them 4 hours to clean up the leaves, how long would it take his son to clean up the leaves by himself?