It has been raining at the rate of 5 centimeters per hour. If the rain filled a cylindrical drum with a depth of 15 centimeters, and area 300 square centimeters, how long did it take to fill the drum completely?	Choices:
A) 3 hours B) 4 hours 15 minutes C) 6 hours D) 2 hours 5 minutes E) 8 hours
Answer is : A, 3 hours   The volume of the drum is irrelevant and only height matters since rain fell all over the city.   Thus, it takes only 15 / 5= 
<gadget id="calculator">15 / 5</gadget>
<output>3</output>
3 hours of rain to fill the drum
<result>A</result>
It has been raining at the rate of 5 centimeters per hour. If the rain filled a cylindrical drum with a depth of 15 centimeters, and area 300 square centimeters, how long did it take to fill the drum completely?