Barry stands on his head for 10 minutes at a time, but then he must sit for 5 minutes before he can take another turn standing on his head.  How many turns can Barry take standing on his head during a single 2-hour period?
Each turn Barry takes standing on his head lasts for 10+5=
<gadget id="calculator">10+5</gadget>
<output>15</output>
15 minutes.
2 hours is 60*2=
<gadget id="calculator">2*60</gadget>
<output>120</output>
120 minutes.
Barry can take 120/15=
<gadget id="calculator">120/15</gadget>
<output>8</output>
8 turns standing on his head over two hours.

<result>8</result>