Answer:
50 km/hr
Step-by-step explanation:
D = RT
Time for first part of trip = 80/60 = 4/3 hr.
Time for second part of trip = 20/30 = 2/3 hr.
total time for entire trip = 4/3 + 2/3 = 6/3 = 2 hr.
Total distance = 100 km
Average rate of speed for entire trip = 100/2 = 50 km/hr
4(2x)=8x
4(3)=12
8x+12=75
-12
8x=63/8
x=7.89
Where’s the graph ? I think you’ll need to show the graph in order for us to help you