Joe swam at the rate of 4.5 miles per hour. Joseph swam at the rate of 1 12 of a mile per minute. Who was swimming faster? By how many miles per hour faster?

Joseph;

85.5 miles per hour.

Step-by-step explanation:

We need to put their speeds in the same unit.

Joe swam at the rate of 4.5 miles per hour.

Joseph swam at the rate of 1 1/2 of a mile per minute (1.5 miles per minute). Let us convert this to miles per hour.

To do that, multiply it by 60 minutes:

1.5 * 60 = 90 miles per hour

Joseph swam faster, because his speed is greater than Joe's speed.

The difference in their speeds is:

90 - 4.5 = 85.5 miles per hour

Joseph swam 85.5 miles per hour faster than Joe.

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15