SOLUTION: After traveling the first 480 miles in 12 hours the traveler increased her speed by 20 miles per hour.How long did it take her to travel the last 300 miles?

Question 75165This question is from textbook
: After traveling the first 480 miles in 12 hours the traveler increased her speed by 20 miles per hour.How long did it take her to travel the last 300 miles? This question is from textbook

Answer by ptaylor(2198) (Show Source): You can put this solution on YOUR website!
Let t=time it takes to travel the last 300 mi
Distance(d)=rate(r) times time (t) or d=rt; r=d/t; t=d/r
Rate of speed for first 480 mi=480/12=40 mph
For the second leg of the trip, she increased her speed by 20 mph. That would be:
40 mph+20 mph=60 mph=rate of speed for the remaining 300 mi
So t=d/r=300/60=5 hrs--------------------ans

Hope this helps----ptaylor

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