SOLUTION: Michael drove his car to the foothills @ 70mph. Once he arrived @the foothills he biked 30mph. His total trip took 4 hours, and his total distance was 140 miles. How long did he dr

SOLUTION: Michael drove his car to the foothills @ 70mph. Once he arrived @the foothills he biked 30mph. His total trip took 4 hours, and his total distance was 140 miles. How long did he dr

Algebra.Com

Question 1002420: Michael drove his car to the foothills @ 70mph. Once he arrived @the foothills he biked 30mph. His total trip took 4 hours, and his total distance was 140 miles. How long did he drive his car?
Answer by fractalier(6550) (Show Source): You can put this solution on YOUR website!
Call the time he drove his car, t.
Then the time he rode the bike would be 4-t.
Thus we can write
70t + 30(4-t) = 140
70t + 120 - 30t = 140
40t = 20
t = .5 hours
RELATED QUESTIONS
Duane DeSink drove his car to the farm at 54 mph. He returned home by motorcycle at... (answered by ptaylor)

Johnny was able to drive an average of 17 miles per hour faster in his car after the... (answered by ankor@dixie-net.com,KMST)

Michael is traveling at 45 mph to his friends house. When he goes home the same way he... (answered by Alan3354)

Michael drove to a friend`s house a rate of 40 mph. he came back by the same route, but... (answered by checkley77)

Tom had left home and had ridden his bike for 7 km before his chain broke. Tom had to... (answered by ptaylor)

John drove his car into the shop to fix the oil leak in his engine. Once finished, his... (answered by ankor@dixie-net.com)

ben drove the first part of his trip at an average speed of 40 mph. After his car broke... (answered by ikleyn)

Karim took 7 hours to drive 680km. The first part of the trip, he drove at 80km/h. He... (answered by PoCTo)

please help me solve this [[[ Randy drove from his home to Dallas at an average of 50... (answered by stanbon)