6 pipes are required to fill a tank in 1 hour 20 minutes. How long will it take if only5 pipes of the same types are used?
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Time taken by 6 pipes to fill a tank
=1hr 20 min
=80minutes
Time taken by 1 pipe=(80×6 )min
Time taken by 5 pipes= 80×6/5
=96 min
=1hr36min
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