street is AC, turn at B in AC. AB is 630 meters long and BC is 560 meters long. Install street lamps at equal distances on one side of this street. One street lamp must be installed at points A, B, and C. How many street lamps should be installed at least on this street?
一条街道为AC，在AC中的B处转弯．AB长630米，BC长560米．在这条街道一侧等距离装路灯，A、B、C三点必须各装一盏路灯，这条街道最少装多少盏路灯？
<gadget id="calculator">630 - 560</gadget>
<output>70</output>

<gadget id="calculator">630 / 70</gadget>
<output>9</output>

<gadget id="calculator">9 + 1</gadget>
<output>10</output>

<result>10</result>