To build a road, 320 meters can be repaired in 4 hours, how many meters can be repaired in 10 hours.
修一条路，4小时修320米，10小时可以修多少米．
<gadget id="calculator">320 / 4</gadget>
<output>80</output>

<gadget id="calculator">80 * 10</gadget>
<output>800</output>

<result>800</result>