A leak in the bottom of a tank can empty the full tank in 6 hours. An inlet pipe fills water at the rate of 3.5 liters per minute. When the tank is full in inlet is opened and due to the leak the tank is empties in 8 hours. The capacity of the tank is? Choose one.
A) 5729 B) 5040 C) 2889 D) 2870 E) 2799

Rationale: "1 / x - 1 / 6 = - 1 / 8 x = 24 hrs 24 * 60 * 3.5 = 5040 . answer : b"
Answer: B