Question

Worker 'A' can complete the entire task in 35 hours, and Worker 'B' can complete it in 40 hours, when working individually. If both 'A' and 'B' work together, how much time will it take for them to finish 60% of the task?

A 13.2 hours
B 11.2 hours
C 9.6 hours
D 16 hours
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