4 hours and 15 minutes = how many hours.
4小时15分=多少小时．
<gadget id="calculator">15 / 60</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">4 + (1/4)</gadget>
<output>17/4 = around 4.25</output>

<result>17/4 = around 4.25</result>