A car drives from place A to place B at a speed of 54 kilometers per hour for 2.5 hours, and then travels 3.4 kilometers to reach the midpoint of the two places. How many kilometers are there between A and B?
一辆汽车从甲地开往乙地，以每小时54千米的速度行驶了2.5小时，再行3.4千米到达两地的中点．甲乙两地相距多少千米？
<gadget id="calculator">54 * 2.5</gadget>
<output>135</output>

<gadget id="calculator">135 + 3.4</gadget>
<output>138.4</output>

<gadget id="calculator">138.4 * 2</gadget>
<output>276.8</output>

<result>276.8</result>