Discussion

Explanation:

3 ⅖ tons of water is admitted in 12 mins.

So, in 60 mins (17/5 × 60/12) = 17 tons of water is admitted i.e. 17 tons/hr.

So, net inlet of water = 17 – 12 = 5 tons/hr to sink 

Hence, to admit 60 tons it has 60 ÷ 5 = 12 hours

The ship needs to cover a distance of 72 kms in 12 hours to avoid sinking.

Speed of ship = 72/12 = 6 km/hr

Hence, option (d).

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