SOLUTION: Nancy drives 20 miles to her school each day. If she drives 10 miles per hour faster, it takes her 4 minutes less to get to school. Find her new speed

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Question 830805: Nancy drives 20 miles to her school each day. If she drives 10 miles per hour faster, it takes her 4 minutes less to get to school. Find her new speed
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
rt=20,
(r+10)*(t-4/60)=20
r = 50, t = 2/5
r+10=60 new speed