SOLUTION: A Mississippi riverboat can travel 70 kilometers downstream in 5 hours and can make the return trip in 7 hours. Find the speed of the boat in still water.
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Question 816624: A Mississippi riverboat can travel 70 kilometers downstream in 5 hours and can make the return trip in 7 hours. Find the speed of the boat in still water. Answer by mananth(16946) (Show Source):
You can put this solution on YOUR website! boat speed = x
current speed =y
upstream speed = x-y ------- time 7 hours
downstream speed = x+y---------time = 5 hours
distance = 70
t= d/r
70/(x-y)=7
simplify
x-y=10....................(1)
70/(x+y)=5
x+y=14.....................(2)
add (1) & (2)
2x=24
x=12 mph speed of boat
