book Maths Puzzle Numerical Ability

5xsquared + 14x - 3 = 0

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The problem that I am having trouble with is:

Assume that the marked speed limit is 65 MPH on a highway in which you are traveling 232 miles.
If you go the speed limit, how man
Can someone please answer the question 2700, that is already on your site.

Thank yuou very much!