Question

A student ran the 100-m dash in 15.4 s. What was the student’s speed in miles per hour?

Answer 1

Answer:

Speed of the student was 14.51 miles per hour.

Step-by-step explanation:

A student ran the dash = 100 m

Since 1 meter = 0.000621 miles

Therefore, 100 meter = 100× 0.000621

                                   = 0.0621 miles

He ran the dash in 15.4 seconds

∵ 3600 seconds = 1 hour

∴1 second = $\frac{1}{3600}$ hour

∴ 15.4 seconds = $\frac{15.4}{3600}$ hour

                         = 0.00428 hours

Now we know the formula to calculate the speed

Speed = $\frac{\text{Disatance}}{\text{Time}}$

           = $\frac{0.0621}{0.00428}$ miles per hour

           = 14.51 miles per hour

Speed of the student was 14.51 miles per hour.

Answer 2

15.4 seconds = 0.00428 hours and 100 meters = 0.062 miles soo the student ran approximately 14.5 mph