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A ship, 40 kilometres from the shore, sp...

A ship, 40 kilometres from the shore, springs a which admits `3 3/4` tonnes of water in 12 minutes. 60 tonnes would suffice to sink her, but the ship, pumps can throw out 12 tonnes of water in hour. Find the average rate of sailing, so that may reach the shore just as she begins to sink. `1 1/2k m//h r` b. `\ 2 2/1k m//h r` c. `3 1/2k m//h r` d. `4 1/2k m//h r`

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