don't know this

Question

A motorboat takes 4

 hours to travel 192

 kilometers going upstream. The return trip takes 3

 hours going downstream. What is the rate of the boat in still water and what is the rate of the current? 

Answer 1

4(b-c) = 192

3(b+c) = 192

time times speed = distance

b-c = 192/4 = 48

b+c = 192/3 = 64

2b = 112

b = 56 mph= boat speed in still water

c = 8 mph= current speed