It takes 50 seconds for the water delivery workers of Zhengguanghe Drinking Water Company to go up each flight of stairs, so how many seconds does it take for the water delivery workers to deliver a bucket of water to the fifth floor?
正广和饮用水公司的送水工人，每上一层楼梯要50秒，那么，送水工人送一桶水到5楼需要多少秒．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">50 * 4</gadget>
<output>200</output>

<result>200</result>