Question

Two typists of different speeds can complete a typing job together in 6 minutes. If the 1st typist types alone for 4 minutes and then the 2nd typist types alone for 6 minutes, they would be left with 1/4 of the total work. In how many minutes can the slower typist complete the job working alone?

A 20 mins
B 18 mins
C 24 mins
D 10 mins
E None of these
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