SOLUTION: How do I solve? A boat can go 20 miles against the wind in the same time that it can go 60 miles with the wind. The wind is blowing at 4 mph. Find the speed of the boat with no

Question 874240: How do I solve?
A boat can go 20 miles against the wind in the same time that it can go 60 miles with the wind. The wind is blowing at 4 mph. Find the speed of the boat with no wind.
A. 4mph
B. 8 mph
C. 40 mph
D. 80 mph
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
boat speed x mph with no wind
wind speed 4 mph

against wind x - 4 mph
with wind x + 4 mph

Distance against wind 20
Distance with wind 60
Time = same equate the time against with time with current
t=d/r
20 /(x- 4 )= 60 /(x+ 4 )
20 *(x+ 4 )= 60 *(x- 4 )
20 x + 80 = 60 x -240
20 x -60 x = -240 + -80
-40 x = -320
/ -40
x= 8 mph
m.ananth@hotmail.ca

RELATED QUESTIONS
A helicopter goes 720 miles with the wind in the same time it can go 630 miles against... (answered by josmiceli,mananth)

An airplane can go 900 miles with the wind in the same time that it can go 720 miles... (answered by mananth)

a plane can travel 480 miles with the wind in two hours. It takes about 3 hours to travel (answered by Fombitz)

A plane traveling at 450 mph can go 1000 miles with the wind in 1/2 hour less than than... (answered by jorel1380)

A small airplane can travel 210 mph in still air. The plane can fly 520 miles with the... (answered by greenestamps,mananth)

A plane filies 465 miles with the wind and 345 miles against the wind in the same length... (answered by ptaylor)

A boat can go 20 miles against a current in the same time that it can go 60 miles with... (answered by josgarithmetic,stanbon)

A plane can fly 36 miles with the wind, in the same amount of time that it can fly 12... (answered by askmemath)

An airplane flies 720 miles with the wind. In the same amount of time, it can fly 630... (answered by Alan3354)