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1). 402). 453). 604). 72 |
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Answer» Let the EFFICIENCIES of P, Q, R and S be x, y, z and w. P and Q can FINISH a work together in 30 hours. Q, R and S can finish the same work in 20 hours. And when all FOUR of them work together, they finish the work in 15 hours. ⇒ x + y = 1/30 And, y + z + w = 1/20 And, x + y + z + w = 1/15 ⇒ x = 1/15 – 1/20 = 1/60 ⇒ y = 1/30 – x = 1/30 – 1/60 = 1/60 ∴ Q can finish work alone in 60 hours. |
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