A bicycle completed the first 400.0 m of a ride in 75.0 s. What was the bicycle's average speed in kilometers per hour?

Answer 1

You need to convert 400.0 meters to kilometers. We know that 1 km = 1000 m. So we say 400.0 m x (1 km/1000m) = 0.4 km. Then we have to convert 75.0 s to hours. We know that there are 60s in a minute and 60 minutes in an hour. So we say 75.0 s x (1minute/60s) x (1 hr/60 min) = 0.02 hr. So now we divide 0.4 km by 0.02 hr to get our speed in km/hr. 0.4 km/0.02 hr = 20 kilometers/hours.