Pat L.

asked • 02/01/15

Average speeds

An automobile averaged 40 mph for part of a trip and 50 mph for the remainder. If the 5-hour trip covered 210 miles, for how long did the car average 40 mph?

Mitiku D.

tutor
Pat, you do not appear to have your equations bounded, and we can't help get any answer. There's nothing in the question that restricts the value of time the driver did 40 or 50mph. If you are talking about range maybe but.....
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02/01/15

Faraz R.

tutor
It does appear to be bounded.  If x is at 40 mph then 5-x must be at 50.  You solve after that.  I haven't looked at the other one yet. 
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02/01/15

Pat L.

That is exactly how the problem is and I know the answer is 4 hours, but I am unsure of how they got that answer
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02/02/15

2 Answers By Expert Tutors

By:

Jacoby B. answered • 02/02/15

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5.0 (158)

Math, Science and Test Prep Tutor

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