At a station, a train comes every 5 minutes leaving 200 passengers and taking 320 others. How many different passengers step on and off a train at the station within an hour?
At every passenger exchange there are 200 + 320 = 
<gadget id="calculator">200+320</gadget>
<output>520</output>
520 different people.
One hour is 60 minutes, so during one hour, a train comes 60 minutes/hour / 5 minutes/train = 
<gadget id="calculator">60/5</gadget>
<output>12</output>
12 times.
So during one hour, 12 trains * 520 passengers/train = 
<gadget id="calculator">12*520</gadget>
<output>6_240</output>
6240 different passengers step on and off the train.

<result>6_240</result>