Question 74234
DISTANCE=RATE*TIME. THE TWO DISTANCES ARE THE SAME THUS WE HAVE:
20X=30(5-X)
20X=150-30X
20X=30X=150
50X=150
X=150/50
X=3 HOURS GOING UP STEAM. THUS 2 HOURS(5-3=2) RETURN DOWN STREAM.
PROOF
20*3=30(5-3)
60=30*2
60=60