Question

Pipes 'A', 'B', and 'C' working together can fill a tank in 4 hours, while pipes 'B' and 'C' together can fill the same tank in 20/3 hours. How long would pipe 'A' take to fill 45% of the tank by itself?

A 4 hrs 30 mins
B 2 hrs 10 mins
C 4 hrs 40 mins
D 7 hrs 30 mins
E None of these
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