Given: An engineer wishes to use a 3 inch leader to collect rain water from a portion of the roof. The rainfall is 4 inches per hour. In his calculations, the maximum square footage of roof area which he can use for one leader is ___ square feet.

Given: An engineer wishes to use a 3 inch leader to collect rain water from a portion of the roof. The rainfall is 4 inches per hour. In his calculations, the maximum square footage of roof area which he can use for one leader is ___ square feet.