Answer:
67.3km/h
Explanation:
Find the amount of time it took from 10:12 to 11:18.
Which is 66 minutes. 
Find the average speed. 
Formula of average speed = 
Total distance/time
Which is, 
74/66 = 1.121 (recurring decimal) 
1.121 x 60 = 67.26km/h
= 67.3km/h (Estimated to 1 dp)