Question

Charlotte is running at a rate of 9\,\dfrac{\text{km}}{\text{h}}9

h
km
​ .
What is Charlotte's speed in \dfrac{\text{m}}{\text{s}}
s
m
​ ?

Answer 1

Speed of Charlotte in a Unit which includes Km and hour
`=9 \frac{\text{Km}}{\text{hour}}`

1 Km=1000 meter

1 hour=60 minutes=3600 seconds

Speed of Charlotte in a Unit which includes meter and second is

`=(9 * 1000)/(3600)\frac{\text{meter}}{\text{seconds}}\\\\=(90)/(36)\frac{\text{meter}}{\text{seconds}}\\\\=(5)/(2)\frac{\text{meter}}{\text{seconds}}`

Answer 2

Answer: Charlotte's speed in meter/second is 2.5m/s.

Explanation:

Given speed of Charlotte in kilometer per hour = 9 km/h

We need to find the Charlotte's speed in meter per second.

We know 1 kilometer = 1000 meter

And 1 hour = 3600 seconds.

Plugging those values of km and hour in given speed in km/h, we get

`9\ (km)/(h) = 9* \ (1000m)/(3600 seconds)`

`=(10m)/(4s)= 2.5\ m/s`.

Therefore,

Charlotte's speed in meter/second is 2.5m/s.