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

Answer:

Dennis ran miles in 20 minutes = 3

Dennis ran miles in 1 minutes = $\frac{3}{20}$

Dennis ran miles in 60 minutes = $\frac{3}{20} \times 60$

                                                    = $9$

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 = $\frac{6}{30}$

Cindy ran miles in 60 minutes = $\frac{6}{30} \times 60$

                                                    = $12$

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