Eric decides to go to the park. He runs for 20 minutes, then jogs for 10 minutes to reach the park. When he returns, he takes a different route home and this takes him 3 times as long as his trip there. How long does it take Eric to return home?
Eric's trip to the park took 20 minutes running + 10 minutes jogging = 
<gadget id="calculator">20+10</gadget>
<output>30</output>
30 minutes.
So his return trip took 30 minutes * 3 = 
<gadget id="calculator">30*3</gadget>
<output>90</output>
90 minutes.

<result>90</result>