What would be the minimum number of pumps required to fill a tank of 1000 m3 to 85% in one hour? The capacity of the pump is 150 m3/hour and operates at an efficiency of 75%.	Choose the correct choice from the following options:
A) 6  B) 8  C) 10  D) 11  E) 12

Rationale: volume handled by pump in one hour = 150 x . 75 = 112.5 volume of the tank that needs to be filled = 1000 x . 85 = 850 number of pumps needed = 850 / 112.5 = 7.55 â ‰ ˆ 8 answer : b
Answer: B