SOLUTION: My teacher went over these problems in class today. I know that I would set up a chart to help me solve the problem, but I get stuck on how to determine the t in D=rt. Please hel

Question 542971: My teacher went over these problems in class today. I know that I would set up a chart to help me solve the problem, but I get stuck on how to determine the t in D=rt. Please help me!!! Thanks!!!
Two trains leave a station at the same time, heading in opposite directions. One train is traveling at 80 km/h, the other at 90 km/h. How long will it take for the trains to be 425 km apart?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Two trains leave a station at the same time, heading in opposite directions. One train is traveling at 80 km/h, the other at 90 km/h. How long will it take for the trains to be 425 km apart?
----
1st train DATA:
rate = 80 km/hr ; time = t hrs ; distance = 80t km
---------------
2nd train DATA:
rate = 90 km/hr ; time = t hrs ; distance = 90t km
----
Equation:
distance + distance = 425 km
80t + 90t = 425
170t = 425
t = 2.5 hours
=================
Cheers,
Stan H.
=================
RELATED QUESTIONS
Ok my problem is a graph and im supposed to find the quadractic function and put it in... (answered by solver91311,stanbon)

can you help me write an algebraic expression in words for these problems? 15-b, z-7,... (answered by kiljoy)

I need help with finding the slope because in math class today my teacher went over it... (answered by Alan3354,solver91311)

I am trying to solve an equation with fractions. This is the problem 2x over x^2+6x+8 (answered by stanbon)

I'm in 8th grade. I went home sick today and missed some of the classroom lecture, but... (answered by robertb)

I do not understand how to solve these. I have tried to ask my teacher, but there are too (answered by stanbon)

As part of a lab experiment for your chemistry class, you add pure alcohol to 24 ml of a... (answered by Edwin McCravy)

I submitted a problem earlier today and the response definitely helped, but I am stumped... (answered by ptaylor)

Hello I was doing my homework on quadratic functions and I have a question on a problem... (answered by nerdybill)