Khan/khan-exercises — Issue #10295: Rate problems 2 - ambiguity in answering a question in the *Rate Problems 2* exercise
Author: KhanBugz
Created: 2012-01-04 13:04:25+00:00
State: open
Labels: firefox, vista, wrong-or-unclear

I got the following question in the *Rate Problems 2* exercise:

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Starting at home, Michael traveled uphill to the hardware store for 40 minutes at just 9 mph. He then traveled back home along the same path downhill at a speed of 18 mph.

What is his average speed for the entire trip from home to the hardware store and back?
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the correct answer is rounded to the nearest mph, but the question does not specify a rounded answer

[rate_problems_2.html?seed=148&problem=average-speed](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/rate_problems_2.html?seed=148&problem=average-speed&debug)

[Answer timeline](http://sandcastle.khanacademy.org/media/castles/Khan:master/exercises/rate_problems_2.html?seed=148&problem=average-speed&debug&activity=%5B%5B%22correct-activity%22%2C%22%5B%5C%2212%5C%22%5D%22%2C219%5D%5D)

[["12"]]

Mozilla/5.0 (Windows NT 6.0; WOW64; rv:5.0) Gecko/20100101 Firefox/5.0

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