It takes 1 hour to walk from the school to the bookstore at the same speed, and it has been 45 minutes, and there are 900 meters left. How many meters are there from the school to the bookstore?
用相等的速度从学校到书店要走1小时，已经走了45分钟，还剩900米．从学校到书店一共有多少米．
<gadget id="calculator">60 - 45</gadget>
<output>15</output>

<gadget id="calculator">900 / 15</gadget>
<output>60</output>

<gadget id="calculator">60 * 60</gadget>
<output>3_600</output>

<result>3_600</result>