3 units
to the left of
left of - u
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Step-by-step explanation:
Two taps A and B can fill a tank in 40 min and 64 min respectively. Both taps are opened together but due to some problem they work 13/16 and 7/10 of their efficiencies, after some time the problem was removed, the cistern is filled in 22 minutes from that moment. For how long did the
taps flow with less efficiency?
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