SOLUTION: The river is flowing from point A to B at a rate of 15 miles per hour. A boat moves on still water at 45 miles per hour. If it takes David 1 hour and 15 minutes to ride the boat on

Question 317173: The river is flowing from point A to B at a rate of 15 miles per hour. A boat moves on still water at 45 miles per hour. If it takes David 1 hour and 15 minutes to ride the boat on the river from A to B, how long does it take him to make the return trip from B to A?
Answer by ankor@dixie-net.com(22740) (Show Source): You can put this solution on YOUR website!
The river is flowing from point A to B at a rate of 15 miles per hour.
A boat moves on still water at 45 miles per hour.
If it takes David 1 hour and 15 minutes to ride the boat on the river from A
to B, how long does it take him to make the return trip from B to A?
:
Let t = time in hrs to go from B to A
:
change 1 hr 15 min to 1.25 hrs
:
Write a distance equation: dist = speed * time
:
A-B dist = B-A dist
1.25(45+15) = t(45-15)
1.25(60) = 30t
75 = 30t
t =
t = 2.5 hrs
;
:
Check solution by finding the distances
1.25(60) = 75
2.5(30) = 75

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