Increasing speed by 5 mph saves 10 mins?

[KingNothing]

If a person drives the same distance twice, and saves 10 mins by driving 5mph more the second time, what is the distance and the speeds?

 

[chroot]

Speed * time = distance.

Set up two equations -- one for each trip -- and notice that the distances are equal. Thus, you can set the equations equal to each other, arriving at:

Speed1 * time1 = speed2 * time2.

You know that speed2 = speed1 + 5, and that time2 = time1 - 10.

Put these equations together and solve for distance...

- Warren

 

[KingNothing]

Can you work through it for me? I keep getting time1=10+2*speed1...

 

[berkeman]

Can you work through it for me? I keep getting time1=10+2*speed1...

Write out your full two equations and show how you are trying to solve them.