If both are moving in same direction and the submarine is ahead of the warship in both the situations, then the speed of the warship, if the ratio of the speed of warship to that of the submarine is 2 : 1, is:
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
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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