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Unread 11-04-2005, 14:50
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Re: How wide is the river?

Quote:
Originally Posted by gwross
You have to be careful that you're not dividing by zero, though. (Which would happen in the above example if w = -b or if 2w = b.)
Good point. However, since the above example had (w+b) / u = (2w-b) / v, dividing by zero would require both w = -b and 2w = b. That's only possible if w and b are both equal to zero.

Since the original problem had nonzero values for both a and b, we know that we're not dividing by zero.
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