A tank initially holds 240 L. A tap adds 23 L/min while a drain removes 8 L/min for 12 minutes. How much water is in the tank then?

A) 430 L

B) 420 L

C) 410 L

D) 440 L

Answer: B

Explanation: Final tank volume = initial volume + (inflow rate − outflow rate) × time.
240 + (23 − 8) × 12 = 420 L.