Question

Dennis ran 3 miles in 20 minutes and continues runnin at this rate for 1 hour. Cindy ran 6 miles in 30 minutes and continues running at this rate for 1 hour.

Dennis will run ? miles in 1 hour. Cindy will run ? miles in 1 hour.
? will run ? miles farther than ? in 1 hour.

Answer 1

Dennis will run 9 miles in 1 hour. Cindy will run 12 miles in one hour. Cindy will run 3 miles farther than Dennis in 1 hour.

Answer 2

Dennis ran miles in 20 minutes = 3

Dennis ran miles in 1 minutes =
`(3)/(20)`

Dennis ran miles in 60 minutes =
`(3)/(20) * 60`

=
`9`

60 minutes = 1 hour

So, Dennis ran 9 miles in 1 hour

Cindy ran miles in 30 minutes = 6

Cindy ran miles in 1 minutes =
`(6)/(30)`

Cindy ran miles in 60 minutes =
`(6)/(30) * 60`

=
`12`

So, Cindy ran 12 miles in 1 hour

Difference in distance traveled in 1 hour = 12 miles - 9 miles = 3 miles

Hence Cindy ran 3 miles farther than Dennis in 1 hour