It takes Mr. Wang 15 minutes to go from home to school, which is 5 minutes shorter than the original time. What fraction of the time does it take Mr. Wang to go from home to school now?
王老师从家到学校现在要15分钟比原来用时缩短了5分钟，现在王老师从家到学校所用的时间是原来的几分之几？
<gadget id="calculator">15 + 5</gadget>
<output>20</output>

<gadget id="calculator">15 / 20</gadget>
<output>3/4 = around 0.75</output>

<result>3/4 = around 0.75</result>