SOLUTION: Bret started on a 80-mile bicycle ride at 15 miles per hour. After a time he became a little tired and slowed down to 10 miles per hour for the rest of the trip. The entire trip of
Algebra ->
Finance
-> SOLUTION: Bret started on a 80-mile bicycle ride at 15 miles per hour. After a time he became a little tired and slowed down to 10 miles per hour for the rest of the trip. The entire trip of
Log On
Question 885668: Bret started on a 80-mile bicycle ride at 15 miles per hour. After a time he became a little tired and slowed down to 10 miles per hour for the rest of the trip. The entire trip of 80 miles took
5 1/2 hours. How far had Bret ridden when he reduced his speed to 10 miles per hour? Answer by josmiceli(19441) (Show Source):
You can put this solution on YOUR website! Let = distance Bret had traveled
at mi/hr
Let = time spent traveling at mi/hr = distance Bret traveled at mi/hr = time spent traveling at mi/hr
----------------
Equation for riding at 15 mi/hr:
(1)
Equation for riding at 10 mi/hr
(2)
(2)
(2)
---------------------
Substitute (1) into (2)
(2)
(2)
(2)
(2)
(1)
(1)
(1)
----------------
Bret had ridden 75 mi at 15 mi/hr
check:
----------------
(2)
(2)
(2)
OK
