Question

A submarine descends 40 feet per minute. What will be its position after 5 minutes?

• A. –100 feet
• B. –8 feet
• C. –45 feet
• D. –200 feet

Answer 1

The correct option is D –200 feet

The submarine is 40 feet below the sea level in 1 minute. This can be represented as –40 feet.

At 5 minutes, the position of the submarine is given by $5\times –40\text{feet}.$

$\text{Positive}\times \text{Negative}=\text{Negative}$

$⟹5\times –40\text{feet}=–(5\times 40)=–200\text{feet}$

Thus, the position of the submarine after 5 minutes will be –200 feet, which is 200 feet below the sea level.