A tank when full can be emptied by an outlet pipe A in $5.6$ hours, while an inlet pipe B can fill the same empty tank in $7$ hours. If pipes A and B ...
Question
A tank when full can be emptied by an outlet pipe A in $5.6$ hours, while an inlet pipe B can fill the same empty tank in $7$ hours. If pipes A and B are operated alternately for $1$ hour each, starting with pipe A when the tank is full, how long will it take to empty the tank?