Rob can tar a roof in nine hours.One day his friend Kayla helped him and it only took hime 4.74 hours. How long would it take Kayla to do it alone

Question

asked May 12, 2017 221k views

1 Answer

Pedjjj · Answer 1 · 2017-05-17T08:34:52+0000

9x10.014084507 / 9 + 10.014084507 = 4.74
90.126760563 / 19.014084507= 4.74 4.74 = 4.74

therefore Kayla can do it in 10.01 hrs