A lion weighs 0.28 tons, the weight of the European bison is 3.4 times that of the bison, and the weight of the hippopotamus is 3.5 times that of the bison. How many tons is the weight of the hippopotamus?
一头狮子重0.28吨，欧洲野牛的重量是它的3.4倍，河马的重量又是野牛的3.5倍，河马的重量是多少吨？
<gadget id="calculator">0.28 * 3.4 * 3.5</gadget>
<output>3.332</output>

<result>3.332</result>