Three taps A, B and C fill a tank in 20 min, 15 min and 12 min, respectively. If all the taps are opened simultaneously, how long will they take to fill 40% of the tank?

• ক 2 minutes ✅ সঠিক উত্তর
• খ 40 seconds
• গ 25 seconds
• ঘ 1 minutes