Question

Brian runs 8 miles in 84 minutes. At the same rate, how many minutes would he take to run 6 miles?

minutes

Answer 1

63 minutes

Explanation:

Use a proportion.

8 miles is to 84 minutes as 6 miles is to x minutes.

8/84 = 6/x

Reduce the fraction on the left side.

4/42 = 6/x

Cross multiply.

4x = 6 × 42

2x = 3 × 42

x = 3 × 21

x = 63

Answer: 63 minutes