Average Speed = total distance/total time
total distance = 7 km + 2km = 9 km
total time = 2 hours + 1 hour = 3 hours
Avg. Speed = 9/3 = 3 km/hour
Avg. velocity = total displacement/total time
In this case distance = displacement for same direction.
So, average velocity = 3 km/hour
Answer: The average velocity of the whole journey is 3 km/hr.
SPEED
speed = distance/time
find speed for first given value
speed = distance/time = 7 Km/ 2 hours = 3.5 Km/h
Now find speed for 2nd given value
speed= distance/time = 2 Km/ 1 hours = 2 Km/h
AVERAGE SPEED
3.5 Km/h + 2 Km/h = 5.5 /2 Km/h = 2.75 Km/h
The average speed is 2.75 Km/h.
VELOCITY
V= S / t ( where v = velocity, s = distance and t = time )
find velocity for first given value
s = 7 km
t = 2 hours
V = 7/2
V = 3.5 km/ hr
Now we find velocity for 2nd given value
s = 2 km
t = 1 hours
V = 2/1
V = 2 km/ hr
AVERAGE VELOCITY
3.5 + 2 = 5.5 /2 = 2.75 Km/h
The average VELOCITY is 2.75 Km/h.