Two pipes A and B can fill a tank in 36 hours and 46 hours respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?	Choose the correct option:	A) 20.195 hrs	B) 21.195 hrs	C) 22.195 hrs	D) 23.195 hrs	E) 20.495 hrs
a fill in one hour = 1/36   b fill in one hour = 1/46   both fill in one hour = 1/36+1/46   = 82/1656   time taken by both pipes = 1656/82   =20.195 hrs   20.195 hrsNSWER:20.195 hrs
<result>A</result>
Two pipes A and B can fill a tank in 36 hours and 46 hours respectively. If both the pipes are opened simultaneously, how much time will be taken to fill the tank?