rob can tar a roof in nine hours. one day his friend kayla helped him and it only took 4.74 hrs. how long will it take kayla to

Question

Sholpan [36]

2 years ago

11

rob can tar a roof in nine hours. one day his friend kayla helped him and it only took 4.74 hrs. how long will it take kayla to

do it alone?

Mathematics

1 answer:

jekas [21] · Answer 1 · 2022-05-25T01:50:15+03:00

<span>When 2 people work the formula is: Person1 * Person2 / (Person1 + Person2)
</span>
<span>rob becomes Person1 and Kayla becomes Person 2
9 * K / (9 + K) = 4.74 Hours
9*K = 4.74*9 + K*4.74
9*K = 42.66 + K*4.74 4.26 *K = 42.66 K = 10.014084507 hours (Kayla)
TESTING the answer (9 * 10.014084507) / (9 + 10.014084507) = 4.74 90.126760563 / (19.014084507) = 4.74
4.74 = 4.74
</span>