What is the greatest possible rate at which a man can walk 51 km and 85 km in an exact number of minutes?

11 km/min

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13 km/min

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17 km/min

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None of these

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Solution

The correct option is C 17 km/min
The answer would be given by the HCF of 51 and 85 - which is 17. Hence, option (c) is correct.

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