Question

A boat takes 8 hours to go 6 miles upstream and come back to the starting point. If the speed of the boat is 4 miles per hour in still water, what is the rate of the current? Hint: total time taken = time taken to go upstream + time taken to go downstream 10 miles per hour 8.63 miles per hour 3.16 miles per hour 2.24 miles per hour

Answer 1

 v=d/t; t=d/v 
let c=rate of the current 
6/(4+c)+6/(4-c)=8 
(24-6c+24+6c)/(16-c²)=8 
48=128 - 8c²; c=√10 miles per hour

Answer 2

Answer:

Correct answer the this problem:

Step-by-step explanation:

c. 3.16 miles per hour.