The cheetah is the fastest animal in the world, it can reach 110km per hour, 30km more than twice as fast as the elephant. How many kilometers per hour can an elephant reach?
猎豹是世界上跑得最快的动物，能达到每小时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>