CISTERNS

1.      If a pipe can fill a tank in x hours, then part of tank filled in one hour = 1/x

2.      If a pipe can empty a full tank in y hours, then part emptied in one hour = 1/y

3.      If a pipe can fill a tank in x hours, and another pipe can empty the full tank in y hours, then on opening both the pipes,

the net part filled in 1 hour = (1/x-1/y)  if y>x

the net part emptied in 1 hour = (1/y-1/x) if x>y


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