两道道英语智力测试题~~谢谢各位帮帮忙~~急~~

1.My bath has two taps and a plug hole（出水孔）.The cold tap on its own fills the bath in 12 minutes,the hot one in 5 minutes. The plug hole can drain（排干）the bath in 30 minutes with the taps off. How long will the bath take to fill if I leave both taps on with the plug out?

2.If the only sister of your mother's only brother has an only child,what would be your relationship to that child?

谢谢各位啦~~速啊~事后酬谢~~

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