Question

‘P’ and ‘Q’ together can finish a task in 15 days while ‘Q’ alone can do it in 25 days. If the ratio of efficiencies of ‘P’ and ‘R’ is 3:5 respectively, then find the ratio of efficiencies of ‘Q’ and ‘R’.

A 8:9
B 7:5
C 5:4
D 9:10
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