Rain is falling at a rate of 10 centimeters per hour all over North Carolina. Somewhere downtown in North Carolina a group of people are waiting for the rain to stop. If the rain filled a round puddle the with a base area of 300 square centimeters and a depth of 30 centimeters, how long did the people wait for the rain to stop? Choose the correct option
A) 4 hours  B) 11 hours  C) 7 hours 15 minutes  D) 3 hours  E) 14 hours
Answer is : D, 3 hours   The volume of the puddle is irrelevant and only height matters since rain fell all over the city.   Thus, it takes only 30 / 10= 
<gadget id="calculator">30 / 10</gadget>
<output>3</output>
3 hours of rain to fill the puddle
<result>D</result>
Rain is falling at a rate of 10 centimeters per hour all over North Carolina. Somewhere downtown in North Carolina a group of people are waiting for the rain to stop. If the rain filled a round puddle the with a base area of 300 square centimeters and a depth of 30 centimeters, how long did the people wait for the rain to stop?