Sarah's speed is \(\frac{ 1\frac{3}{4} miles}{50 mins}\)
Is the same as, \(\frac{ \frac{7}{4} mile}{50 mins}\)
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 = \(\frac{1}{60}\) hour
∴ 50 minute = \(50* \frac{1}{60}\) hours
= \(50* \frac{1}{60}\) hours
= \(\frac{50}{60}\) hours
= \(\frac{5}{6}\) hours
So, Sarah's speed in miles per hour is - \(\frac{\frac{7}{4} miles}{ \frac{5}{6} hrs}\).
Also, as \(\frac{7}{4}\) is equal to 1.75.
And, as \(\frac{5}{6}\) is equal to 0.83.
So, Sarah's speed can also be expressed as \(\frac{1.75 miles}{0.83 hrs}\)
