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Question

‘R’ and ‘S’ together can finish a work in 25 days. If ‘R’ increases his efficiency by 60% and ‘S’ decreases his efficiency by 20%, then the time taken remains unchanged. Find the ratio of efficiencies of ‘R’ and ‘S’, respectively.

A 1:2

B 2:3

C 3:4

D 1:1

E None of these

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