Question 61006
DISTANCE=RATE*TIME
72=3R OR R=72/3 OR R=24 MPH DOWNSTREAM
60=6R OR R=60/6 OR R=10 MPH UP STREAM
TO FIND THE CURRENT WE ONLY NEED TO FIND 1/2 THE DIFFERENCE IN THE TWOSPEEDSUP & DOWN STREAM THUS (24-10)/2=14/2=7 MPH FOR THE CURRENT