There are 3 kids waiting for the swings and twice as many kids waiting for the slide. If each kid waits 2 minutes for the swings and 15 seconds for the slide, how many seconds shorter is the shorter wait?
First find the total wait time for the swings in minutes: 3 kids * 2 minutes/kid = 
<gadget id="calculator">3*2</gadget>
<output>6</output>
6 minutes.
Then convert that number to seconds: 6 minutes * 60 seconds/minute = 
<gadget id="calculator">6*60</gadget>
<output>360</output>
360 seconds.
Then find the total number of kids waiting for the slide: 3 kids * 2 = 
<gadget id="calculator">3*2</gadget>
<output>6</output>
6 kids.
Then find the total wait time for the slide: 15 seconds/kid * 6 kids = 90 seconds.
Then subtract the total wait for the slide from the total wait for the swings to find the difference: 360 seconds - 90 seconds = 
<gadget id="calculator">360-90</gadget>
<output>270</output>
270 seconds.

<result>270</result>