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标题: 7月175题 [打印本页]

作者: falcons    时间: 2005-8-18 06:55     标题: 7月175题

7月175题,麻烦大家了

175. a, b , c three pumps. A’s rate is smaller than B’s rate. Is C’s rate smaller than B’s?

(1) A, B work together use 1/2 time than C works alone.

(2) Forgot

Anyway the final equation is (1) B=(4/3)c (2) A+B=2C

条件一充足吗?我觉得如果B的rate比A的rate高,那么(A+B)/2=C<B, 到底对不对呢?






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