Lake contains 1200 cubic metre of water, then the depth lake is :
Answer: (3) 3 m
Let the depth of the lake be X m
length = 40 m & breadth = 10 m
The volume of the lake = l x b x h
Where, l = length of the lake, b = breadth of the lake & h = height of the lake
Then, 40 x 10 x h = 1200
h = 1200/400
h = 3 m
Then, the depth of the lake is 3 m.
Hence, the answer is (3) 3 m.