Pipe 'A' can fill a tank in 5 hr while pipe 'B' empties the full tank in 8 hr.if both the pipes operate simultaneously, in how much time will the tank be filled?
STEP 1 :
Pipe 'A' can fill the tank in 5 hr
then in 1 hr. = 1 / 5 part of tank
Pipe 'B' can empty a tank in 8 hr
then in 1 hr. = 1 / 8 part of tank
STEP 2 :
Both pipe operate in 1 hr = 1 / 5 - 1 / 8 part of tank
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