a painter can finish a house in 5 hours. Her assistant takes 7 hours to finish the same job. How long would it take for them to

Question

3 years ago

8

complete the job if they were working together?

1 answer:

mars1129 [50] · Answer 1 · 2022-04-09T11:10:17+03:00

Answer:

D

Step-by-step explanation:

Call the first person A who can do the job in 5 hours.

Call the second person B who can do the job in 7 hours.

The formula for this problem is

Time = A*B/(A + B)

Time = 5*7 / (5 + 7)

Time = 35 / 12

Time = 2 hours and 11/12 of an hour.

The answer is D.