A boat has a speed of 15 mph in calm water. It takes the boat 3 hours to travel upstream but only 2 hours to travel the same distance downstream. Which equation can be used to find c, the speed of the current

Question

anonymous · Answer

_____________     speed__________time__________distance
Upstream_______ 15-c___________3_____________d=(15-c)*3{rate*time}
Down stream_____15+c__________2_____________d=(15+c)*2 

d is equal for both directions, so equate the expressions:
(15-c)*3=(15+c)*2

anonymous · Answer

simplify it to get c..speed of current

anonymous · Answer

and hope you know why upstream speed is 15-c and down stream speed is 15+c

anonymous · Answer

simplification...
45-3c=30+2c
15=5c
c=3mph