Question
Two inlets X, Y fill the tank in 18 and 9 minutes.
Outlet Z is 50% less efficient than X. ‘X’ and ‘Z’ open for 6 minutes, then X is replaced with Y. Find total time to fill the tank.Solution
Tank = 18x units
X = x, Y = 2x, Z = 0.5x
6 mins: (x - 0.5x) × 6 = 3x
Remaining = 18x - 3x = 15x
Net = 2x - 0.5x = 1.5x
Time = 15x / 1.5x = 10 minutes
Total = 6 + 10 = 16 minutes
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