ctmt41971 ctmt41971
  • 20-03-2024
  • Mathematics
contestada

If a fountain completely drains in 4 hours with the first valve open, and in 5.25 hours with the second valve open, how many hours will it take to completely drain with both valves open?
a) 2.1 hours
b) 3.4 hours
c) 3.6 hours
d) 3.9 hours

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