Question

‘P’ can complete 80% of a task in 32 days and ‘Q’ can do 60% of the task in 54 days. If ‘P’, ‘Q’, and ‘R’ all work together, they can complete the full task in 24 days. What is the ratio of the efficiencies of ‘P’, ‘Q’, and ‘R’?

A 5:4:6
B 9:4:2
C 9:3:2
D 7:3:2
E None of these
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