A car drives from place A to place B at 46 kilometers per hour. After driving for 3 hours, it is still 15 kilometers away from the midpoint. How many kilometers are the distance between places A and B?
一辆汽车从甲地开往乙地，每小时行46千米，行了3小时，距中点还差15千米，甲乙两地相距多少千米．
<gadget id="calculator">46 * 3</gadget>
<output>138</output>

<gadget id="calculator">138 + 15</gadget>
<output>153</output>

<gadget id="calculator">153 * 2</gadget>
<output>306</output>

<result>306</result>