John plays at the arcade for 3 hours. He uses $.50 for every 6 minutes. How much money did he spend, in dollars?
Please answer and provide answer explanation.
15
He was at the arcade for 3 * 60 = 180 minutes.

So he put coins in 180 / 6 = 30 times.

That means he spent 30 *.

5 = $15.

.

So, the answer is 15