Xiaomei rowed a small boat upstream and put the straw hat on the stern. The straw hat was blown into the river by the wind. When he found out and turned the bow, the straw hat was already 1 km away from the boat. Driving at a speed of 1,000 kilometers, and the speed of the water flow is 2 kilometers per hour, so how many hours does it take for him to catch up with the straw hat?
小梅划一条小船向上游划去，将草帽放在了船尾，草帽被风吹进了河中，当他发现并调过船头时，草帽已与船相距1千米，若船是以每小时5千米的速度行驶，水流速度每小时2千米，那么，他追上草帽需要几小时？
<gadget id="calculator">2 - 2</gadget>
<output>0</output>

<gadget id="calculator">5 + 0</gadget>
<output>5</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>