Dongfanghong Primary School used 360 tons of water in April this year, and 300 tons of water in May. Compared with April, the water fee was saved by 120 yuan in May. How much is it per ton of water?
东方红小学今年四月份用水360吨，五月份用水300吨．五月份比四月份节约水费120元，每吨水多少元？
<gadget id="calculator">360 - 300</gadget>
<output>60</output>

<gadget id="calculator">120 / 60</gadget>
<output>2</output>

<result>2</result>