car drives from place A to place B, and then returns on the same road for a total of 7.2 hours. It travels 40 kilometers per hour when it goes there, and 50 kilometers per hour when it returns. How many kilometers are there between A and B?
一辆汽车从甲地开往乙地，然后又原路返回，一共行驶了7.2小时，去时每小时行40千米，返回时每小时行50千米．甲乙两地相距多少千米？
<gadget id="calculator">360 / 90</gadget>
<output>4</output>

<gadget id="calculator">40 * 4</gadget>
<output>160</output>

<result>160</result>