Mrs. Gwen just started exercising. She walked 4/5 of a mile in 45 minutes. What is the unit rate when her speed is expressed in miles per hour?

Question

You are trying to find the unit rate miles per hour. she walked 4/5 of a mile 4/5 being a fraction and she walked this in 45 minutes.

Answer 1

4/5 mile in 45 minutes means 45 mile per ¾ hour.

 

4/5 divided by 3/4 is done by MULTIPLYING 4/5 BY 4/3; the result is 16/15 miles per hour.

 

(Natalie's comment is not correct)

Answer 2

The trick with unit conversions is to make sure the units work correctly:

4/5 = .8

.8 miles/45 min * 60 min/hr => 48/45 mph = 16/15 mph

 

Another way to see it is:

4/5 mile/3/4 hr = 4/5*4/3 mph = 16/15 mph = 1 1/15 mph