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3 typists P, Q and R type some pages. The first two typists P and Qwho are typing constantly, can do a work as long as the third typist Rdoes alone. If the same work can be done by the second typist alone,in less than 5 hours before the first typist and in 4 hours more incomparison with the third typist, how long will Q and R take to com-plete this work together ? |
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