Question

Curtis rides his bike 9 miles one way then turns around and rides back. On the return trip, his speed is increased 20% because the wind is at his back. Let s be his speed in miles per hour riding against the wind. What is an expression that represents his total time in hours riding there and back?

Answer 1

Answer: An expression would then be time = s / 9 + (s*1.2)/9 = 2.2s/9

Step-by-step explanation: Time is speed divided by distance. So time = s / 9 against the wind, and (s*1.2)/9 with the wind. An expression would then be time = s / 9 + (s*1.2)/9 = 2.2s/9