A pump is draining a basement subjected to flooding. After 2 hours of pumping, half of the water is removed. A secondary pump was brought into the salvage operation and between the two pumps; the water remaining in the basement was completely drained within 30 minutes. On this premise, what length of time would have been required for the second pump to do the same job without the assistance of the first pump?
A.A.33 hours
B.A.47 hours
C.A.52 hours
D.B.00 hours