Answer:
time = 9 hour
Step-by-step explanation:
1st case,
time(t)=12 × 60 × 60 sec
distance (d)= 480×1000m
speed =distance/time taken
= 480000/43200 m/s
2nd case,
as average velocity is maintained throughout the journey
distance (d')= 360×1000m
time (t')=?
speed =distance /time
or, 480000/43200= 360000/t
or,. t=(360000×43200)/480000
or, t= 32400sec
or, t= 32400/(60×60)
t= 9 hour
