SOLUTION: PLEASE HELP!! John drives at an average speed of 50 miles per hour for the first 4 hours of the 608-mile trip to Springfield. Ethel then drives the remaining distance in 8 hours. W

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Question 125488: PLEASE HELP!! John drives at an average speed of 50 miles per hour for the first 4 hours of the 608-mile trip to Springfield. Ethel then drives the remaining distance in 8 hours. What is Ethel's average driving speed?
Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!
If John drives at 50 mph for 4 hours, he will have travelled 200 miles.

d=rt
50%2A4=200

That means that Ethel must have driven 608-200=408 miles.

Since d=rt, we can say that r=d%2Ft.

r=408%2F8
r=51