SOLUTION: d=r*t I need help finding the proper formula. I will solve the equation. just need help with utilizing proper formula. Thank you. A trucker drove for 4 hours before he en

Question 417729: d=r*t
I need help finding the proper formula. I will solve the equation. just need help with utilizing proper formula. Thank you.
A trucker drove for 4 hours before he encountered icy road conditions. He reduced his speed by 20 MPH and continued driving for 3 more hours. find his average speed during the first part of the trip if the entire trip was 325 miles.
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
speed = x initially
distance = 4x
..
then speed = x-20
distance = 3(x-20)
...
4x+3(x-20)=325
4x+3x-60=325
7x=385
/7
x=55 mph initially
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