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Explanation:

Let the speed of the submarine be x kmph.

Then the speed of the warship is 2x kmph.

Distance travelled by the warship in 30 minutes = x km

Distance travelled by the submarine in 30 minutes = 0.5x km

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From the figure,

x = 253 + 0.5x - 253

∴ 0.53x = 50

∴ x =1003 kmph

∴ The speed of the warship = 2003 kmph.

Hence, option (d).

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