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1). 402). 453). 604). 72

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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