Question
A2 type ‘P’ pipes can fill
a tank in 375 hours, while B2 type ‘Q’ pipes can fill the same tank in 540 hours. (15A × 5B) type ‘P’ pipes can fill the same tank in how many hours? (Efficiency of a type P and a type Q pipe is same)Solution
A2 × 375 = B2 × 540
A2/B2 = 540/375
A2/B2 = 36/25
A/B = 6/5
A = 6B/5
(15A × 5B) type 'P' pipes = 15 × 6B/5 × 5B = 90B2
Required time = (B2 × 540)/(90 × B2) = 6 hrs
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