Two engineering teams, A and B, dug a canal from both ends at the same time, and met at a distance of 15 meters from the midpoint. It is also known that team B dug 40% of the total length. How many meters did team A dig?
甲乙两个工程队同时从两端挖一条水渠，在距离中点15米处相遇，又知乙队挖的是全长的40%，甲队挖了多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">15 / (1/10)</gadget>
<output>150</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">150 * (3/5)</gadget>
<output>90</output>

<result>90</result>