In what time would a cistern be filled by three pipes whose diameters are 1cm, 11/3 cm, 2cm, running together, when the largest alone will fill it in 61 minutes, the amount of water flowing in by each pipe being proportional to the square of its diameter?
(a) 36 minutes (b) 37 minutes
(c) 38 minutes (d) 35 minutes
(a) 36 minutes (b) 37 minutes
(c) 38 minutes (d) 35 minutes
Watch this space for answer in a week.
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