A tank has two taps . When running alone one tap can fill the tank in 20 minutes while the second Can fill the tank in 60 minutes. How long does it take to fill the tank when Both the taps are running together?
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let take time taken by 1st tap =20 min
work done by 1st tap in I min=1/20
time taken by 2nd tap =60
work done by 2nd tap in 1min=1/60
time take by both in 1 daywhen they are working together=1/20+1/60
the ans is =1/15
so time taken by both to complete the work=15 days
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