Answer:
185 minutes
Explanation:
See the attached worksheet. Note that there are no inequalites mentued in the problem. That eliminates options 1 and 4. Option 2 is set up correctly, except that the units are incorrect. The unit for 0.46 is $/min, not just $. The final unit should be minutes, not $.
Option 3 has the correct equation, and units. Note how the word problem can be translated to an equation. Start with setting up an equation, before mentally trying to answer the question. An guess at the answer might be helpful, but work with the equation to insure the details are included. A correct equation will allow proper unit cancellation, which will help verify that the answer is correct. In this case we wanted an answer with just minutes. Dividing $ by $/min reduces to only minutes ($/$/min = min).
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Making an estimate first is a good safeguard against mistakes. We can mentally round up $0.46 to 50 cents/minute. If the total bill is almost $90, we'd expect an answer around 180 minutes ((90/0.5). We got 185, so we can feel comfortable that the problem was done correctly and quickly move on.