SOLUTION: A family is on a road trip. The speed limit during the first 115 miles of the trip is 65 mph, and the speed limit during the last 165 miles is 75 mph. How many miles per hour over

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Question 1163988: A family is on a road trip. The speed limit during the first 115 miles of the trip is 65 mph, and the speed limit during the last 165 miles is 75 mph. How many miles per hour over the speed limits must they drive in order to arrive at their destination in 3.5 hours?
Found 2 solutions by ikleyn, MathTherapy:
Answer by ikleyn(52756) About Me  (Show Source):
You can put this solution on YOUR website!
.

    115%2F%2865%2Bx%29 + 165%2F%2875%2Bx%29 = 3.5  hours


Solve for x.

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Actually,  the meaning of this problem is  DARK,  and,  probably,  due to this reason it would be better do not even try to solve it.



Answer by MathTherapy(10549) About Me  (Show Source):
You can put this solution on YOUR website!
A family is on a road trip. The speed limit during the first 115 miles of the trip is 65 mph, and the speed limit during the last 165 miles is 75 mph. How many miles per hour over the speed limits must they drive in order to arrive at their destination in 3.5 hours?
The speed limits were given! 

Their AVERAGE SPEED MUST be: matrix%281%2C6%2C+%28115+%2B+165%29%2F3.5%2C+%22=%22%2C+280%2F3.5%2C+%22=%22%2C+80%2C+mph%29

You should have the answer when you factor this info. in.