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