Question

Please help!
A car is traveling at a rate of 45 meters per second. What is the car's rate in kilometers per hour? How many kilometers will the car travel in 4 hours? Do not round the answers.

Answer 1

do you know many kilometers in a meter?
and how many seconds in an hour?

Answer 2

1h= 360s
360*45=16200/1000=16.2

Answer 3

Here is a neat little trick to learn. Going from m/s to km/h you multiply the number by 3.6. Going from km/h to m/s you divide the number by 3.6. The reason why would follow from a long hand version of converting 1 km/h or m/s to its converse form.

Ex:

1 km/h

There are 3600s in one hour (60s/min * 60 min/hour).
There are 1000 meters per kilometer.

So lets change this km/s from km/h

(1 km/h) * (1h/3600s) = (1/3600)km/s

Now lets convert to meters:

(1/3600) km/s * (1000m / 1 km) = (1000/3600) m/s = (1/3.6) m/s

Or:

1 km/h = (1/3.6) m/s

To find what 1 m/s equals, simply divide both sides by (1/3.6):

(1 km/h) / (1/3.6) = (1/3.6)/(1/3.6) m/s

3.6 km/h = 1 m/s

Tada