Two taps can fill together a tank in 6 hr 40 minutes. One can fill it independently in 12 hrs, the other can fill inA8 hrsB15 hrsC5 hrsD20 hrsAnswer: B. 15 hrs Read Explanation: x = 6 hrs 40 min = 400 minutes y = 12 hrs = 720 minutes xy/(y-x)= (400 x 720)/(720-400)= 900 min 900/60 hrs = 15hrsRead more in App