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Dhruv facing North walks 3Km at 45° to his right to reach C. Then walks 16Km South, then turns right and walks 7Km, then turns left and walks 8Km to point B. What is the distance between C and B?

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From C to B actually Dhruv actually covers 24Km South and 7Km West distance

So distance of CB is $\sqrt{24^{2}+7^{2}}$=25

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