Question

How long (in seconds) would it take a car to travel 75 m if its speed was 100 km/hr?

Answer 1

Since 1000m=1km, we have 100000m/hr for the car. 75/100000 gets the fraction of how long in an hour it would take. Since there are 60*60=3600 seconds in an hour, we multiply 75/100000 by 3600 to get 2.7 seconds