Answer:
The deep of the water would be 20 cm
Explanation:
step 1
Find the volume of the water
The volume of the water is equal to

we have

substitute


step 2
Find the deep of the water, if the tank is returned to its horizontal position
(resting on its 60 cm × 100 cm base)
Now we have


substitute the given values

solve for H


therefore
The deep of the water would be 20 cm