Question

'E' can complete (3/7) of a project in 21 days, while 'E' and 'F' together can complete the same project in 28 days. Determine the time taken by 'F' to complete 30% of the project alone.

A 12.5 days
B 10.2 days
C 8.5 days
D 19.6 days
E none of these
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