Yurko saw a tractor slowly pulling a long pipe down the road. Yurko walked along beside the pipe in the same direction as the tractor,and counted 140 paces to get from one end to the other.Then he turned around and walked back to the other end,taking only 20 paces.The tractor and Yurko kept to a uniform speed and Yurko's paces were all 1 m long.Prove that the pipe is 35 m long
