We need first to change the speed of miles per hour to meter per min, then compare both speeds
Since 1 mile = 1.61 km
Since 1 km = 1000 m, then
1 mile = 1 x 1.61 x 1000
1 mile = 1610 meters
Since 1 hour = 60 min, then
50 miles per hour = 50 miles / 1 hour
Multiply 50 by 1610
Multiply 1 h by 60
[tex]\frac{50miles}{hour}=\frac{50\times1610}{1\times60}[/tex]
Simplify it
[tex]\frac{50miles}{hour}=\frac{80500}{60}=1341\frac{2}{3}meters\text{ per min}[/tex]
Since the other speed is 1250 meters per min
Since 1341 2/3 > 1250
Then you have to drive at 50 miles per hour