A tank initially holds 200 L. A tap adds 21 L/min while a drain removes 6 L/min for 10 minutes. How much water is in the tank then?

A) 360 L

B) 350 L

C) 340 L

D) 370 L

Answer: B

Explanation: Final tank volume = initial volume + (inflow rate − outflow rate) × time.
200 + (21 − 6) × 10 = 350 L.