Question

Rebecca ran 21 miles in 5 hours. If she ran at a constant speed, how many miles did she run in 2 hours?

Answer 1

[AI-generated answer — Bot GPT 3.5]

Rebecca ran 21 miles in 5 hours, which means she ran at a speed of 21 miles / 5 hours = <<21/5=4.2>>4.2 miles per hour.

Since she ran at a constant speed, in 2 hours, she would have run 4.2 miles/hour * 2 hours = <<4.2*2=8.4>>8.4 miles. Answer: \boxed{8.4}.