Answer:
because they have a lot of time working together and really never return home, leaveing them to mate
Answer: 
Explanation:
Assuming that the Earth is a solid sphere, of mass
and radius
around an axis that passes through its center, with uniform density (that is: its center of mass coincides with the center of the sphere), its moment of inertia
is given by the following formula:
(1)
Where:

(2)
Finally:

The average depth of the Nile is 8-11 meters (±26-36 feet).
That would rule out large ships.
A smaller cruise boat is possible, but there will be other obstacles.