সব প্রশ্নে ফিরে যান
Math
A tap can fill a tank in 6hours.After half hour the tank filled ,three more similar taps are opened.What is the total time taken to fill the tank completely?
A) 3hrs 15min
B) 3hrs 45 min
C) 4hrs
সঠিক উত্তর
D) 4hrs 15min