Mathematics

Karly Chan

3 April, 18:01

A student on the track team runs 45 minutes each day as a part of her training. She

begins her workout by running at a constant rate of 8 miles per hour for a minutes,

then slows to a constant rate of 7.5 miles per hour for b minutes.

Which equation describes the relationship between the distance she runs in miles, D,

and her running speed, in miles per hour?

a. a + b = 45

b. Sa + 7.50 = D

6 8) + 7.50 = D

d. 8 (45 - b) + 7.5b = D