A tap can fill a tank in 16 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?	Answers:  A) 2 hrs  B) 1 hrs  C) 10 hrs  D) 5 hrs  E) 4 hrs
Explanation:   A tap can fill a tank in 16 hours.   Therefore the tap can fill half the tank in 8 hours.   One tap take time to fill half of the tank = 8 hrs   4 taps take time to fill half of the tank =8/4= 
<gadget id="calculator">8/4</gadget>
<output>2</output>
2 hrs   Total time taken to fill the tank= 8 hr+2 hr = 10 hrs   Answer : 10 hrs
<result>C</result>
A tap can fill a tank in 16 hours. After half the tank is filled, three more similar taps are opened. What is the total time taken to fill the tank completely?