Problema Solution
A boat's crew rowed 16 miles downstream, with the current, in 2 hours. The return trip upstream, against the current covered the same distance, but took 4 hours. Find the crew's rowing rate in still water and the rate of the current.
Answer provided by our tutors
D=RT
16=R*2
R=16/2
R=8 MPH. WITH THE CURRENT.
16=R*4
R=16/4
R=4 MPH AGAINST THE CURRENT.
(8-4)/2=4/2=2 MPH IS THE RATE OF THE CURRENT.
8-2=6 MPH RATE OF THE BOAT IN STILL WATER.
4+2=6 MPH DITTO.
PROOF:
16=(6+2)*2
16=8*2
16=16
16=(6-2)4
16=4*4
16=16