A motorboat covers a distance of 16km upstream and 24km downstream
in 6 hours. In the same time it covers a distance of 12 km upstream and
36km downstream. Find the speed of the boat in still water and that of the
stream.
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An ecosystem is a geographic area where plants, animals, and other organisms, as well as weather and landscape, work together to form a bubble of life. Ecosystems contain biotic or living, parts, as well as abiotic factors, or nonliving parts. ... Ecosystems can be very large or very small.
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