Question

A circular running track is 1/4 miles long. Elena runs in this track, completing each lap in 1/20 of an hour . What is Elena’s running speed? Include the unit of measure.

Answer 1

Answer : The Elena’s running speed is, 5 mile/hour

Step-by-step explanation :

Speed : It is defined as the rate at which an object moves with respect to time.

To calculate the time taken for the given speed, we use the equation:

`s=(d)/(t)`

where,

s = speed = ?

d = distance traveled =
`(1)/(4)miles`

t = time taken =
`(1)/(20)hour`

Putting values in above equation, we get:

`s=(((1)/(4)miles))/(((1)/(20)hour))\\\\s=(20)/(4)miles/hour\\\\s=5mile/hour`

Hence, the Elena’s running speed is, 5 mile/hour

Answer 2

`5(miles)/(hour)`

Explanation:

we know that

The speed is equal to divide the distance by the time

Let

x-----> the distance in miles

y-----> the time in hours

s----> the speed in mph

so

`s=(x)/(y)`

we have

`x=1/4\ miles`

`y=1/20\ hour`

substitute

`s=((1/4))/((1/20))=5(miles)/(hour)`