Question

it takes Sarah 50 minutes to walk to her friends house 1 3/4 miles away. What is her walking pace in miles per hour?

Answer 1

Sarah's speed is
`( 1(3)/(4) miles)/(50 mins)`

Is the same as,
`( (7)/(4) mile)/(50 mins)`

We need to find her speed in miles/hr.
We have her speed in miles/min.

So, we have to convert the 50 mins to hour.

1 minute =
`(1)/(60)` hour
∴ 50 minute =
`50* (1)/(60)` hours

= 
`50* (1)/(60)` hours

=
`(50)/(60)` hours

= 
`(5)/(6)` hours

So, Sarah's speed in miles per hour is -
`((7)/(4) miles)/( (5)/(6) hrs)`.

Also, as
`(7)/(4)` is equal to 1.75.

And, as
`(5)/(6)` is equal to 0.83.

So, Sarah's speed can also be expressed as
`(1.75 miles)/(0.83 hrs)`

Answer 2

50 minutes= 5/6 hr

(1 3/4 miles)/ (5/6 hr)= 2.1 miles/hr

Hope this would help~