If a truck travels at a speed of 40 km/h on an ordinary road, how many kilometers can it travel in 4 hours?
卡车在普通公路上以40千米/时的速度行驶，4小时可以行驶多少千米．
<gadget id="calculator">40 * 4</gadget>
<output>160</output>

<result>160</result>