physical science
posted by kelsey .
Brad rides his bike 20 km. He covers the distance in 45 minutes (0.75 hours). What is his speed in kilometers per hour? A.44 km/hr B.15 km/hr C.9.0 km/hr D.27 km/hr

speed= distance/time= 20km/.75hr=80/3 km/hr= 27km/hr

He travels 20 km in 0.75 hours. Therefore me must be going more than 20 km/hr.
Which do you think is the most reasonable answer? 
15 km/hr

27 KM/Hr

Idi