pveerina/khan-exercises — comment on commit caa5793527d532fcdcf6179f24920c0c5ff03e6b
File: exercises/rate_problems_2.html line 59
By smenks13:

I'm thinking: \times\dfrac{1 \text{ hour}}{60 \text{ minutes}} instead. So flip the fraction to 1 hour over 60 minutes so that the units come out right.