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Filling a tub |
2015-01-02 |
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Mr pose la question :
The cold tap can fill a bath in 5minutes,the hot tap in 15,and the waste pipe empty the full bath in 10 minutes. All three are fully open for 2 minutes,after which the waste-pipe is closed. How much longer will it take to fill the bath?
Penny Nom lui répond. |
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