A car travels from A to B at a speed of 60 kilometers per hour. After 3 hours, it will pass the midpoint of 20 kilometers. How many kilometers are there between A and B?
汽车以每小时60千米的速度从甲地去乙地，3小时后过中点20千米，甲乙两地相距多少千米．
<gadget id="calculator">60 * 3</gadget>
<output>180</output>

<gadget id="calculator">180 - 20</gadget>
<output>160</output>

<gadget id="calculator">160 * 2</gadget>
<output>320</output>

<result>320</result>