8. Marvel and Merriel drive to their grandmother's house, and they drove the 60-mile trip in two hours. When they return home, the traffic was heavy, their trip took three hours. What was their average trip for the round trip? 9. A bus leaves in city at 8:25 am and arrives in bus station at 10:50 am. The distance between the two is 210 km. Find the average speed in km/h. 10. Neil rides his bike with a constant speed of 12 km/h. How long will he take to travel a distance of 8 kilometers? (in minutes)
