Answer:
54 km/h
Step-by-step explanation:
From H to G:
Let the distance be x km.
Average speed = distance/time
60 = x/ 3
60*3 = x
x = 180 km
From G to F:
Let the distance be y km.
Average speed = distance/time
45 = y/2
45*2 = y
y = 90 km
From H to F:
Total distance = x + y = 180 + 90 = 270 km
Total time = 3 + 2 = 5 hours
Average speed from H to F
= Total distance/ total time
= 270/ 5
= 54 km/h
