Two engineering teams, A and B, started construction at the same time from both ends of the mountain, and dug a tunnel, which was connected after 7 days. It is known that it takes 15 days for Team A to drill alone, and Team B can drill 240 meters per day on average. How many meters can team A drill through on average every day?
甲、乙两个工程队分别从山的两端同时动工，开凿一条隧道，7天后连通．已知甲队单独凿通需15天，乙队平均每天能凿通240米．甲队平均每天能凿通多少米？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 / 15</gadget>
<output>1/15 = around 0.066667</output>

<gadget id="calculator">(1/7) - (1/15)</gadget>
<output>8/105 = around 0.07619</output>

<gadget id="calculator">240 / (8/105) / 15</gadget>
<output>210</output>

<result>210</result>