SOLUTION: A Motorist can decrease by 2 hours the time it takes to travel 400 miles if he increases his average speed by 10 miles per hour. What is the motorists original average speed in mil

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Question 850181: A Motorist can decrease by 2 hours the time it takes to travel 400 miles if he increases his average speed by 10 miles per hour. What is the motorists original average speed in miles per hour? (Only an algebraic solution will be accepted.)
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
r*t=400,
(r+10)*(t-2)=400
r = 40, t = 10