A pipe fill a tank in 3hrs.another pipe fill that same tankin 2hrs.if both pipe inserted in tank to fill it how timw itwill take to fill?

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1. 1 1/5 hrs

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2. consider the tank capacity as 90 litres.
   to fill the tank in 3 hrs first pipe must flow at a rate of 30 litres/hr
   2nd pipe has to flow at a rate of 45 litres/hr
   if two pipes are opened at a time the flow rate will become 75 litres/hr
   90/75= 6/5 = 1.2= (i.e) 1hr and 12 minutes 1 1/5 hr

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