Asked by de lover
                there are two taps, the small one uses forty five minutes to fill a tank and the big one uses thirty minutes to do the same how many minutes will the tank be filled when the two taps were opened at the same time to fill the same tank.
            
            
        Answers
                    Answered by
            Reiny
            
    rate of smaller tap = 1/45 tanks/min
rate of larger tap = 1/30 tanks/min
combined rate = (1/45 + 1/30) tanks/min
= 1/18 tanks/min
time at combined rate = 1/(1/18) min
= 18 minutes
    
rate of larger tap = 1/30 tanks/min
combined rate = (1/45 + 1/30) tanks/min
= 1/18 tanks/min
time at combined rate = 1/(1/18) min
= 18 minutes
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