SOLUTION: A container ship left the Danie Pier and traveled north. An aircraft carrier left four hours later traveling at 30 mph in and effort to catch up to the container ship. After trav

Question 519897: A container ship left the Danie Pier and traveled north. An aircraft carrier left four hours later traveling at 30 mph in and effort to catch up to the container ship. After traveling for eight hours the aircraft carrier finally caught up. What was the container ship's average speed?
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
speed of container ship = x mph
in 4 hours it travels 4x
aircraft carrier speed = 30 mph
catchup speed = 30-x
time taken = 8 hours
d/r=t
4x/(30-x)=8
4x=8*30-8x
4x=240-8x
12x= 240 mph
x=20 mph speed of container ship
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