Question

i need help with this really bad

Answer 1

There are 630 dishes that need to be rinsed. John can rinse them in 70 minutes by himself. It will take his friend Bob 150 minutes to rinse these dishes. How long will it take them if they rinse these 630 dishes together?

Answer 2

hint: \[\frac{t}{70} + \frac{t}{150} = 1\]
where t is the total time it takes for them together

solve for t

Answer 3

/\[\frac{ 630 }{ 70 } + \frac{ 630 }{ 150 }\]

Answer 4

?

Answer 5

how did you get that again?