Aboat traveled 210 miles downstream and back. the trip downstream took 10 hous. the trip back took 70hours. what is the speed of the boat in still water. what is the speed of the current

The boat rates are 21 mph and 3 mph.
to find the speed you rate times time equals the distance.
so you do,

10 × r = 210
the speed equals 21mph

70 × r = 210
the speed equals 3mph

my guess is the boat is going 21 mph and the current is 3 mph
Hope this helps

Ithink if im not mistaking b is -3 but im not a 100% sude

Ibelieve that the answer is 1 but i could be wrong