It takes 240 tons of water to fill a pool. Pipe A can inject 36 tons of water per hour, and pipe B alone can fill the pool for 10 hours. If two water pipes are opened at the same time, how many hours can the pool be filled?
装满一个水池需水240吨，甲水管每小时可注水36吨，乙水管单独开10小时可把水池装满，如果两个水管同时开，几小时可把这个水池装满？
<gadget id="calculator">240 / 10</gadget>
<output>24</output>

<gadget id="calculator">36 + 24</gadget>
<output>60</output>

<gadget id="calculator">240 / 60</gadget>
<output>4</output>

<result>4</result>