1.

1). 502). 443). 564). 54

Answer»

The ratio of EFFICIENCIES of P, Q and R is 4 : 3 : 8.

Let their efficiencies be 4T, 3T and 8T, respectively. Their total efficiency will be 15T.

We know, TIME to finish work is INVERSELY proportional to efficiency.

⇒ 4.5 × 3T = Time REQUIRED × 15T

⇒ Time required = 4.5/5 = 0.9 hours = 54 minutes



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