Question

Traveling downstream a certain boat went 21 mph. Traveling upstream it went only 5 mph. Find the speed of the boat in still water and the speed of the current.
speed of boat --- x
speed of current -- y

x+y = 21
x-y = 5

add the two equations, and continue
what does M grade mean making progress less than 70
Traveling downstream a certain boat went 21 mph. Traveling upstream it only went 1 mph. Findthe current and the speed of the boat if there were no current.
Traveling downstream a certain boat went 21 mph. Traveling upstream it only went 11 mph.

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