Question 182578
The speed of a stream is 5mph. If a boat travels 66 miles down stream in the same time that it takes to travel 33 miles upstream. What is the speed of the boat in still water?
--------------------------
Call the speed of the boat b
Going downstream, the speed relative to the dirt is b+5
Upstream, it's b-5
t = time
t = 66/(b+5)
t = 33/(b-5)
--------------
66/(b+5) = 33/(b-5)
66(b-5) = 33(b+5)
66b-330 = 33b+165
33b = 495
b = 15 mph