1. A ship 55 km from the shore springs a leak which admits 2 tonnes of water in 6 minutes, 80 tonnes would suffice to sink her, but the pumps can throw out 12 tonnes an hour. The average rate of sailing that she may just reach the shore as she begins to sink is:
Answer: 5.5 km/hSol. In 1 h water entered into shop = (20 – 12) = 8 tonnes Now, it will take 10 hrs to allow to enter 80 tonnes of water into ship and in this time ship has to cover 55 km of distance. Hence, required speed = 5.5 km/h.