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Question 1018405: One competitor in a 100 mile bicycle race took a total of 5 hours to complete the course. His average speed in the mnorning was 23 miles per hour. His average speed in the afternoon was 13 miles per hour. How many hours did he ride in the morning, and how many hours he ride in the afternoon?
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! One competitor in a 100 mile bicycle race took a total of 5 hours to complete the course.
His average speed in the morning was 23 miles per hour.
His average speed in the afternoon was 13 miles per hour.
How many hours did he ride in the morning, and how many hours he ride in the afternoon?
:
let t = time riding at 23 mph in the morning
total time given as 5 hrs, therefore
(5-t) = time riding at 13 mph in the afternoon
:
Write a distance equation, dist = speed * time
morning dist + afternoon dist = 100 mi
23t + 13(5-t) = 100
23t + 65 - 13t = 100
23t - 13t = 100 - 65
10t = 35
t = 35/10
t = 3.5 hrs at 23 mph in the morning
then
5 - 3.5 = 1.5 hrs at 13 mph in the afternoon
:
:
Check this, find the actual dist at each speed
3.5(23) = 80.5 mi
1.5(13) = 19.5 mi
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total dist: 100 mi
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