Bob can do a job in 5 hours while Bill can do the same job in 8. How many hours would it take them, working together, to do this

Question

3 years ago

8

Bob can do a job in 5 hours while Bill can do the same job in 8. How many hours would it take them, working together, to do this

job?
BTW no one has the right answer plz help me! Just give me an answer and ill literately give you brainliest i'm in a really bad hurry right now PLZ HELP ME!

Mathematics

2 answers:

ivann1987 [24] · Answer 1 · 2022-07-24T04:55:36+03:00

ivann1987 [24]3 years ago

6 0

Answer:

It's 40/13

Step-by-step explanation:

kiruha [24] · Answer 2 · 2022-07-24T02:38:53+03:00

kiruha [24]3 years ago

5 0

Answer:

3 1/3 hr

Step-by-step explanation:

Bob's rate:: 1/5 job/hr

Bill's rate:: 1/8 job/hr

together rate:: 1/x job/hr

Equation:

rate + rate = together rate

1/5 + 1/8 = 1/x

8x + 5x = 40

13x = 40

x = 40/13 = 3 1/3 hr (time to do the job together)