Two pipes ?A? and ?B? can fill a tank in 15 minutes and 20
minutes respectively. Both the pipes are opened together but
after 4 minutes, pipe ?A? is turned off. What is the total
time required to fill the tank ?
(a) 10 mt 30 sec
(b) 14 mt 40 sec
(c) 10 mt 20 sec
(d) 11 mt 45 sec
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