A bicycle completed the first 400.0 m of a ride in 86.8 s. What was the bicycle's average speed in kilometers per hour?

16.6 km/h

Step-by-step explanation:

Speed = distance/time

= 400.0 m/86.8 s

= 4.608 m/s Convert kilometres to metres

Speed = 4.608m/s * (1 km/1000 m)

= 0.004 608 km/s Convert seconds to hours

Speed = 0.004 608 km/s * (3600 s/1 h)

= 16.6 km/h