In order to move the oil barrel to the car, the master worker came up with a way to save energy, that is, to build a wooden board behind the car. The radius of the oil drum is 30 cm. The oil barrel is pushed onto the cart, how many meters is this board long? (The value of π is 3.14)
工人师傅为了把油桶搬到汽车上，想出了一个省力气的办法，就是在汽车后面搭一块木板，油桶的半径是30厘米，工人师傅推着油桶沿木板滚了5圈正好把油桶推上了车，这块木板长多少米？(π值取3.14)
<result>9.12</result>