ANSWER
175 miles in 3.5 hours
Step-by-step explanation
We want to find the option that has a unit rate of 50 miles per hour.
To find the unit rate, we have to divide the distance travelled by the time taken.
OPTION F
Unit rate = 210 / 4 = 52.5 miles per hour
OPTION G
Unit rate = 300 / 5 = 60 miles per hour
OPTION H
Unit rate = 250 / 4 = 62.5 miles per hour
OPTION I
Unit rate = 175 / 3.5 = 50 miles per hour]
The correct option is the last one.