question_answer

Water flows in a tank \[\mathbf{110 m\times 100 m}\]at the base, through a pipe whose cross-section is 2 cm by 2.5 cm at the speed of 12 km per hour. In how many hours, the water will be 6 m deep in the tank?

A)  70 hours                                                          

B)  90 hours

C)  110 hours     

D)  130 hours

E)  None of these