Discussion

Explanation:

Radii of the two pipes are 3/2 cm and 6 cm.

Square of the radii of the pipes are 9/4 and 36/4.

Given, flow of water in pipes ∝ 1/(radius)2

∴ Required ratio of rates of flow in the two pipes = 19/4 : 136/4 = 19 : 136 = 4 : 1

Hence, option (d).

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