Kalon and his friend Marna own a chimney sweep service company. Working together, they can clean a chimney in 1mc021-1.jpg hours. If it takes Kalon 4 hours to clean a 20-foot chimney by himself, how long does it take Marna to clean the same size chimney by herself?

1)3 hours
2)4 hours
3)5 hours
4)6 6/7

Question

Kalon and his friend Marna own a chimney sweep service company. Working together, they can clean a chimney in 1mc021-1.jpg hours. If it takes Kalon 4 hours to clean a 20-foot chimney by himself, how long does it take Marna to clean the same size chimney by herself?

1)3 hours
2)4 hours
3)5 hours
4)6 6/7

maddytarin_98 · Answer

Kalon|  Rate: 1/4     Time: 1 5/7     Fraction completed:3/7

marna| Rate:1/x       Time: 1 5/7     Fraction completed:12/7x