Cheetahs can run 110km per hour, 30km more than twice as fast as elephants. How many kilometers per hour can an elephant reach?
猎豹每小时可以跑110km，比大象的2倍还多30km．大象最快能达到每小时多少千米？
<gadget id="calculator">110 - 30</gadget>
<output>80</output>

<gadget id="calculator">80 / 2</gadget>
<output>40</output>

<result>40</result>