Question

Mrs. Cho drives 45 miles in one hour if her speed stays constant how many hours will it take for her to drive 405 miles?

Answer 1

You do 405 divided by 45 and the answer is 9

Answer 2

You can make proportion for this:
1 hr/45 miles=x/405
You cross-multiply like this: 405×1=405, then, 405÷45
The quotient is how many hours Mrs. Chi drives in 405 miles.
x= 9 hours
Hope I helped