Question

a boat's crew rowed 12 miles downstream with the current in 1.5 hours. the return trip upstream covered the same distance but took 4 hours. find the crews rowing rate in still water and the rate of the current

Answer 1

r = d / t
so ...
row + current = 12 / 1.5 = 8
row - current = 12 / 4 = 3

add the two equations to get
2 row = 11
row = 11/2 = 5.5

therefore
current = 2.5

(all in miles per hour)

Answer 2

Does that help? Need more explanation?

Answer 3

Thank you