SOLUTION: for two hours of a 400 mile trip your average speed is 40 mph. Determine the average speed that must be maintained for the remainder of the trip if you want to average speed for t

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Question 878327: for two hours of a 400 mile trip your average speed is 40 mph. Determine the average speed that must be maintained for the remainder of the trip if you want to average speed for the trip to be 50 mph
Answer by lwsshak3(11628) About Me  (Show Source):
You can put this solution on YOUR website!
for two hours of a 400 mile trip your average speed is 40 mph. Determine the average speed that must be maintained for the remainder of the trip if you want to average speed for the trip to be 50 mph
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average speed=distance/travel time
remainder of trip=400-80=320 miles
let x=travel time for remainder of trip at 50 mph
400/(2+x)=50
100+50x=400
50x=300
x=6 hrs
speed=320/6=53 1/3 mph