Question

pump a can unload a ships cargo in 30 hrs and pump b can unload the same ship in 24hrs. how long would it take if both pumps were used together?

Answer 1

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Answer 2

in an hour pump A can unload 1/30 of a cargo
in an hour pump B can unload 1/24 of a cargo
in an hour BOTH pumps can unload 1/30 + 1/24 of a cargo.

the denominator of this sum is the answer.