Pipe A can fill a tank in 16 hrs and pipe B can fill it in 24 hrs. If both the pipes are opened in the empty tank. In how many hours will it be fill 5/4th of that tank?  Choose the correct choice: A) 10 B) 12 C) 14 D) 16 E) 18
Part filled A in 1 hr= (1/16)   Part filled 12 in 1 hr= (1/24)   Part filled by (A+12) together in 1 hr=(1/16)+(1/24)=5/48   So, The tank will be full in 48/5 hrs   Time taken to fill Exact quarter tank = (48/5) * (5/4)= 
<gadget id="calculator">(48/5) * (5/4)</gadget>
<output>12</output>
12 hrs   Answer : 12
<result>B</result>
Pipe A can fill a tank in 16 hrs and pipe B can fill it in 24 hrs. If both the pipes are opened in the empty tank. In how many hours will it be fill 5/4th of that tank?