Khan/khan-exercises — Issue #4992: Rate problems 2 - Rate problems
Author: KhanBugz
Created: 2011-10-25 20:08:38+00:00
State: open
Labels: firefox, xp

Reporter: nrblandford@aol.com

I am a math GED teacher who uses Khan Academy as a way to help adults practice the math necessary to pass the GED. I always try to answer the questions in a section prior to my students trying it so I can assist them with answering it.

I have detected a potential flaw with Rate Problems 2, more specifically, the uphill/downhill problem. Running through the hints, the distance uphill is determined as speed x time. It then says 4mph x 60 minutes = 4 miles. Obviously, 60 minutes was changed to 1 hour, but a lot of students wouldn't pick this up and be confused, especially with no video to explain this.

I think this issue can be resolved by including the conversion from minutes to hours in the hints. If you could do this, I think it would be beneficial.

Thanks.

[rate_problems_2.html?seed=76&problem=average-speed](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/rate_problems_2.html?seed=76&problem=average-speed&debug)

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