Answer: 1230
Step-by-step explanation:

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
Answer:
320 students
Step-by-step explanation:
10,000=400+30x
10,000-400
9600=30x
9600/30
320=x
7/9 would be irrational, I think.