SOLUTION: Please show me how to solve this problem Richard's average driving speed is 3 miles per hour faster than grace's. In the same length oftime it takes Richard to drive 180miles, G

Algebra ->  Human-and-algebraic-language -> SOLUTION: Please show me how to solve this problem Richard's average driving speed is 3 miles per hour faster than grace's. In the same length oftime it takes Richard to drive 180miles, G      Log On


   

Question 639162: Please show me how to solve this problem
Richard's average driving speed is 3 miles per hour faster than grace's. In the same length oftime it takes Richard to drive 180miles, Grace only drives 168 miles. What is Richard's average driving speed?
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
You can put this solution on YOUR website!
Richard's average driving speed is 3 miles per hour faster than grace's.
In the same length it takes Richard to drive 180 miles, Grace only drives
168 miles.
What is Richard's average driving speed?
:
let s = Grace's driving speed
then
(s+3) = Richard's speed
:
Write a time equation; time = dist/speed
:
R's travel time = G's travel time
180%2F%28s%2B3%29 = 168%2Fs
Cross multiply, solve for s