A) \[r=\frac{6}{2}=3\,\,\text{cm}\]
B) \[(y-x)\,\,\text{hours}\]
C) \[\frac{xy}{x-y}\text{hours}\]
D) \[\frac{xy}{y-x}\text{hours}\]
Correct Answer: D
Solution :
Part of the tank filled in 1 h \[=\frac{1}{x}\] Part of the tank emptied in 1 h \[=\frac{1}{y}\] Part of the tank filled in 1 h when both are opened \[=\frac{1}{x}-\frac{1}{y}=\frac{y-x}{xy}\] \[\therefore \] Tank will be filled in \[\frac{xy}{y-x}\text{h}\text{.}\]You need to login to perform this action.
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