The world's record in the 100 m dash is 9.69 seconds and in the 100 yard dash is 9.21 seconds.
a) find the speed in mi/h of the runner who set the record of 9.69 seconds.
b) find the speed in mi/h of the runner who set the record of 9.21 seconds.

A) The speed of the runner is 23.085 mile/hr.

B) The speed of the runner is 22.209 mile/hr.

Explanation:

A) Distance covered in 9.69 seconds = 100 m

1 mile = 1609.34 m

1 hour = 3600 seconds

9.69 s =

Speed of the runner =

The speed of the runner is 23.085 mile/hr.

B) Distance covered in 9.21 seconds = 100 yards

1 mile = 1760 yards

1 hour = 3600 seconds

9.21 s =

Speed of the runner =

The speed of the runner is 22.209 mile/hr.

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