Answer:
average speed = total distance travelled÷ total time taken
distance 120 km
time is 1 hr and 20 minutes
from 0700 t0 0820
1hr = 60 minutes
= 20 minutes
1/3 hr
total time is 1 1/3 hr
speed = 120/ 1 1/3
= 120 * 3/ 4
= 90 km/ hr
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