SOLUTION: During the first 4 hours of a trip, you average 40MPH. How long must you travel at 60MPH to finish with an overall average speed of 55MPH?

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Question 51443: During the first 4 hours of a trip, you average 40MPH. How long must you travel at 60MPH to finish with an overall average speed of 55MPH?
Answer by Paul(988) About Me  (Show Source):
You can put this solution on YOUR website!
let x be the time
EQUATION:
40(4)+60x=55(x+4)
160+60x=55x+220
5x=60
x=12
HEnce, you must travel for 12 hours.
Paul.