Question

Justin's boat travels 175 km downstream in 5 hours and it travels 189 km upstream in 7 hours. Find the speed of the boat in still water and the speed of the stream's current.

Answer 1

since distance = speed * time, if the boat has speed b in still water, and the stream has speed s, we have
5(b+s) = 175
7(b-s) = 189
now solve as usual

Answer 2

idkk