Average speed = distance / time
Average speed = 90 km / 0.5 hrs
Average speed = 180 km per hour
Answer:

Explanation:
given,
length of the ship = 120 m
length of model of the ship = 4 m
Speed at which the ship travels = 70 km/h
speed of model = ?
by using froude's law

for dynamic similarities




hence, the velocity of model will be 12.78 km/h
They made me do it I don’t even know what to say I’m so sorry