Xiaofang leaves home at 7:45 in the morning and arrives at school at 8:05, how much does it cost her to go to and from school
小芳早上7：45从家出发，8：05到校，她往返一趟学校要多少分
<gadget id="calculator">20 * 2</gadget>
<output>40</output>

<result>40</result>