Mathematics, 17.09.2019 15:30 niyah2x3

Company alpha can produce 500 desks in 3 days while company beta can produce 700 desks in 4 days. if the two companies join forces, how many days would it take them to produce 3000 desks?
about 7 days
about 9 days
about 11 days
about 13 days
pump 1 can empty a pool in 5 hours while pump 2 can empty the same pool in 9 hours. if the two pumps were to work together, how long would it take them to empty the pool? about 3 hours
about 3 hours and 15 minutes
about 3 hours and 30 minutes
about 3 hours and 45 minutes

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