# A runner covers a distance of 23.5 miles in 2hrs a. What is the runner's velocity? b What is the runner's velocity in m/s ? (1mi=1609.3)?

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**The first part of this question requires you to know the definition of velocity:**

a) Velocity, in this case, is defined as **distance traveled over a period of time (distance/time).**

The runner moves a distance of 23.5 miles in 2 hours. The velocity of the runner is therefore (23.5 miles)/(2 hours), which is equal to **11.75 miles/hour.**

**The second part of this question requires you to know the conversion between miles and meters and hours and seconds****:**

b) Meters are a unit of measurement, meaning that they have a direct conversion value to miles. That number is **1609.344 meters to 1 mile.**

We now need the number of seconds in an hour. This conversion is well-known. There are sixty minutes in an hour and sixty seconds in a minute. This means that **the number of seconds in an hour is (60 x 60) or 3600 seconds**.

Now that we have the number of meters in a mile and the number of seconds in an hour, we are ready to convert our equation.

(11.75 miles/hour) * (1609.344 meters/1 mile) * (1 hour/3600 seconds) = **5.25 meters/second.**

First, let us find the runner's velocity in miles per hour. The velocity v can be found as the distance by the time during which the distance was traveled:

`v = 23.5/2 = 11.75` miles per hour (mph).

To convert the velocity from the miles per hour to meters per second, consider that 1 mile = 1.6093 kilometers = 1609.3 meters and

1 hour = 60 minutes = 60*60 = 3600 seconds.

Then, `11.75 mph = 11.75* (1609.3 m)/(3600 s) = 5.253 m/s `

**So, if the runner covers a distance of 23.5 miles in 3 hours, his velocity in meters per second is 5.253 m/s.**