Answer: 4800 containers
Explanation:
We can see that along the length, the ship can carry (1200 / 30) = 40 containers and along the width, it can carry (300/10) = 30 containers.
Since the containers can be stacked four high, the number of containers that the ship can carry at a time would be:
= 40 × 30 × 4.
= 4800 containers