SOLUTION: A diesel train left berlin and traveled nort at an average speed of 20 mph. A freight train left at the same time and traveled in the opposite direction with an average speed of 60

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Question 830659: A diesel train left berlin and traveled nort at an average speed of 20 mph. A freight train left at the same time and traveled in the opposite direction with an average speed of 60 mph. Find the number of hours the freight train needs to ravel before the trains are 640 mi. apart
Answer by JulietG(1812) About Me  (Show Source):
You can put this solution on YOUR website!
D travels 20mph
F travels 60mph in the opposite direction
In one hour, they are 20+60 miles apart (or 80).
How many hours until they corporately travel 640 miles?
Divide 640 by 80 to get 8.
.
Word problems can be tricky not because of the math, but because of the need to throw away some of the information. Why not just ask how many hours the trains need to travel? Wording it with "freight train needs to travel" makes it confusing. Hope this clears it up.