Respuesta :

mhanifa

Answer:

11

4

Step-by-step explanation:

3 hrs to travel 45 miles downstream

4 hrs to travel 28 miles upstream

speed of boat in still water= s

speed of the current= c

  • s+c= 45/3= 15
  • s-c= 28/4=7

added up the 2 equations, we get:

  • 2s= 22
  • s= 11 mph
  • c= 4 mph