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40 Γ (3/2)s = 3sΒ² β 60s = 3sΒ² β s = 20.
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Each new radius = 10/2 = 5 cm. Surface area = 4ΟΓ25 = 100Ο.
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Net factor = 0.99 β less by 1% (option 0.01).
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Ratio first:second = (60β52):(52β40) = 2:3. First = (2/3)Γ240 = 160 litres.
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Downstream : upstream speeds = 41 : 31. Time upstream = (41/31) Γ (31/6) = 41/6 hours = 6 hours 50 min.
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3, 5 and 9 are odd; 4 is even.
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