Pipe A can fill an empty tanks in 12 hours and pipe B in 14 hours. If both pipes are opened and after 4 hours Pipe A is close, how much time B will take to fill the renaming tank?
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Answer:
1 hr 20 m
Step-by-step explanation:
Pipe A fills tank in 4 hours
Pipe A fills 1/4 tank in 1 hour
Pipe B fills tank in 2 hours
Pipe B fills 1/2 tank in 1 hour
Pipe A + Pipe B can fill 1/4 + 1/2
= 1/4 + 2/4
= 3/4 tank in 1 hour
The answer is the reciprocal
The tank will fill in 4/3 hours = 1 hour 20 minutes
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