Two cylinders, the height of A is 5cm, the radius of the bottom surface of A is (1/3) of the radius of the bottom surface of B, and their lateral areas are equal, what is the height of cylinder B?
两个圆柱，甲的高为5cm，甲的底面半径是乙底面半径的(1/3)，它们的侧面积相等，则乙圆柱高为多少？
<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<result>5/3 = around 1.666667</result>