Rain is falling at a rate of 36 centimeters per hour all over Springfield. Somewhere downtown in Springfield a group of old people is waiting for the rain to stop. If the rain filled a round tank the with a base area of 150 square centimeters and a depth of 6 centimeters, how long did the people wait for the rain to stop?
Answers.
A) 6 hours B) 7 hours 15 minutes C) 5 hours D) 12 hours E) 10 hours
Answer is : A, 6 hours   The volume of the tank is irrelevant and only height matters since rain fell all over the city.   Thus, it takes only 36 / 6= 
<gadget id="calculator">36 / 6</gadget>
<output>6</output>
6 hours of rain to fill the tank
<result>A</result>
Rain is falling at a rate of 36 centimeters per hour all over Springfield. Somewhere downtown in Springfield a group of old people is waiting for the rain to stop. If the rain filled a round tank the with a base area of 150 square centimeters and a depth of 6 centimeters, how long did the people wait for the rain to stop?