Zhang Yuan's home is 800 meters away from the school. He walks x meters per minute. How many meters will he be away from the school in 3 minutes?
张媛家到学校800米，他每分钟走x米，3分钟后离学校还有多少米．
<gadget id="calculator">800 - 3</gadget>
<output>797</output>

<result>797</result>