4 large vehicles transport 80 tons of coal 5 times, 3 small vehicles transport 72 tons of coal 8 times, and now there are 350 tons of coal, how many times does it take for a large vehicle and a small vehicle to transport at the same time?
4辆大汽车5次运煤80吨，3辆小汽车8次运煤72吨，今有煤350吨，一辆大汽车和一辆小汽车同时运需要几次运完？
<gadget id="calculator">80 / 5 / 4</gadget>
<output>4</output>

<gadget id="calculator">72 / 8 / 3</gadget>
<output>3</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">350 / 7</gadget>
<output>50</output>

<result>50</result>