A tank of 425 litres capacity has been filled with water through two pipes, the
first pipe having been opened five hours longer than the second. If the first pipe
were open as long as the second, and the second pipe was open as long as the
first pipe was open, then the first pipe would deliver half the amount of water
delivered by the second pipe; if the two pipes were open simultaneously, the
tank would be filled up in 17 hours. How long was the second pipe open?  Choose the correct option
A) 13  B) 14  C) 15  D) 16  E) 17
Let the 1st and 2nd pipe be x and y respectively   and time = z hours   A/Q   y=2x (since first pipe would deliver half the amount of water   delivered by the second pipe)   (x+y)*17 =425   x+y =25   putting the value of y then we get   3x=25   x=25/3 and y =50/3   (z+5)25/3 + z(50/3) =425   from you can find z which = 15.3 so ans is 15   ANSWER:15
<result>C</result>
A tank of 425 litres capacity has been filled with water through two pipes, the
first pipe having been opened five hours longer than the second. If the first pipe
were open as long as the second, and the second pipe was open as long as the
first pipe was open, then the first pipe would deliver half the amount of water
delivered by the second pipe; if the two pipes were open simultaneously, the
tank would be filled up in 17 hours. How long was the second pipe open?