Water is leaking out from a cylinder container at the rate of 0.31 m^3 per minute. After 10 minutes, the water level decreases 4 meters. What is value of the radius? Choose the most appropriate option:
A) 0.5  B) 1.0  C) 1.5  D) 2.0  E) 2.5
10*0.31= 
<gadget id="calculator">10*0.31</gadget>
<output>3.1</output>
3.1 m^3= pi*R^2*h   R^2 = 3.1 / (pi*4) which is about 1/4   R = 1/2   The answer is 0.5.
<result>A</result>
Water is leaking out from a cylinder container at the rate of 0.31 m^3 per minute. After 10 minutes, the water level decreases 4 meters. What is value of the radius?