Uncle Zhang drove by at a speed of 50 kilometers per hour and traveled from A to B in 2 hours. How much should this road be drawn on a map with a scale of 1:4,000,000?
张叔叔乘车以每小时50千米的速度经过，2小时从甲地到达乙地，这条路在比例尺1：4000000的地图上应画多少．
<gadget id="calculator">50 * 2</gadget>
<output>100</output>

<gadget id="calculator">100 / 40</gadget>
<output>5/2 = around 2.5</output>

<result>5/2 = around 2.5</result>