Maths-
General
Easy
Question
A Submarine descends to 
of its maximum depth. Then it descends another 
of
its maximum depth. If it now at 650 feet below sea level , What is its maximum depth
Hint:
Form the equation using the given information.
○ Take variable quantities as x.
The correct answer is: Hence, the maximum depth is 780 feet.
Answer
- Step-by-step explanation:
○ Given:
First submarine descends to of its maximum depth.
Then it descends another of its maximum depth.
The height below sea level is 650 feet.
○ Step 1:
Let the maximum depth be x feet.
So,
At first, submarine descends = x feet.
Then, submarine descends = x feet.
Total descend = x + x feet
Total descend = x + 
x feet
Total descend = 
x feet
It is given that, height below sea level; is 650 feet
∴ x = 650
5x = 650 × 6
5x = 3900
x = 
x = 780
- Final Answer:
Hence, the maximum depth is 780 feet.
5x = 650 × 6 5x = 3900 x = x = 780Depth is the actual distance of an object beneath the surface, as measured by submerging it with a perfect ruler. The depth of an object in a denser medium as seen from a rarer medium is referred to as apparent depth in a medium. Its value is less than the true depth.
A formula for calculating ocean depth. D = V divided by 1/2 T D stands for depth (in meters) T= Time (in seconds) V = 1507 m/s (speed of sound in water) (speed of sound in water)
Since the speed of sound in water is known, the depth "d" is determined using the straightforward equation "d/2 = vt."
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