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M: +3.00/-0.00

A tank can be filled by two taps X and Y in 5 hrs and 10 hrs respectively while another tap Z empties the tank in 20 hrs. In how many hours can the tank be filled if all 3 taps are kept open?

[RRB NTPC 28 March 2016 Shift 1]
A
B
C
D
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