The distance between the left and right wheels of the racing car is 1.5 meters. When the racing car runs around a circular track with a radius of 10 meters, how many π meters does the outer wheel travel than the inner wheel?
赛车的左、右轮子距离为1.5米，当赛车沿一半径为10米的圆形跑道跑一圈时，外侧的轮子比内侧的轮子多走了多少π米．
<gadget id="calculator">23 - 20</gadget>
<output>3</output>

<result>3</result>