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Two taps X and Y can fill a tank in 10 hrs. and 15 hrs.respectively. If the both taps are opened together, the tank will be full in ----- | |
A. | 3 hrs. [Wrong Answer] |
B. | 4 hrs, [Wrong Answer] |
C. | 5 hrs. [Wrong Answer] |
D. | 6 hrs. [Correct Answer] |