Question

A ship can row 55 km from the shore springs a leak which admits 2 tonnes of water in 6 min 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 1

i am not understanding the first line of your question

Answer 2

Answer:

The required speed is 5.5 km per hour

Step-by-step explanation:

Water entered into the ship in 6 minutes = 2 tonnes

Water entered in ship in 1 minute = $\frac{1}{3}\thinspace tonnes$

Water entered in ship in 1 hour or 60 minutes = $\frac{1}{3}\times 60 = 20\thinspace tonnes$

Water thrown out from the ship in 1 hour = 12 tonnes

So, Total amount of water entered in 1 hour into the ship = 20 - 12 = 8 tonnes

Amount of water needed inside the ship to sink = 80 tonnes.

Therefore, it will take $\thinspace \frac{80}{10}\thinspace$ = 10 hours to completely sink the ship.

Distance to be covered = 55 km

So, the required speed must be $\thinspace \frac{55}{10}\thinspace$ = 5.5 km per hour