A tank can be filled by big pump in 20 hours and by a small pump in 80 hours. How long will it take to fill the tank by both pumps together!
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Answer:
16hr
Step-by-step explanation:
the work done by
big pump in one hr = 1/20
the work done by
small pump in 1hr = 1/80
total work done by them in 1hr = 1/20+1/80
=5/80 = 1/16
therefore both pump can fill the tank in 16 hrs
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