it takes a boat 3 hours to travel 30 miles downstream and 4 hours to travel 24 miles upstream. What is the speed of the boat in still water? What is the speed of the current of the river?

Answer 1

3 hours 30 miles down stream 30 = 3x(10) 10 =b+c

4 hours 24 miles upstream 24 = 4x(6) 6 = b-c

add

2b = 16, b= 8 mph in still water

c =10-8= 2 miles per hour = current speed