A submarine is 50 m below sea level. It goes down a further 280 m to sit on a rock. From the rock, it rises 110 m to the top of a coral. What is the depth of the coral below sea level?

- 220 m

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- 110 m

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- 440 m

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Solution

The correct option is A - 220 m
Position of submarine when it sits on a rock:

The position of the rock = - 330 m
From this position the submarine rises up by 110 m.
The final position of submarine
$= (- 330) + 110$ m

Using number line,

$= (- 330) + 110 = - 220$ m

$∴$ The depth of the coral = $- 220$ m

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A submarine is 50 m below sea level. It goes down a further 280 m to sit on a rock. From the rock, it rises 110 m to the top of a coral. What is the depth of the coral below sea level?

The correct option is A - 220 mPosition of submarine when it sits on a rock: The position of the rock = - 330 m From this position the submarine rises up by 110 m. The final position of submarine =(−330)+110 m Using number line, =(−330)+110=−220 m ∴ The depth of the coral = −220 m