A submarine begins at -125 below sea level. If the submarine travels at 20 feet per minute, how many minutes would it will take the submarine to rise to the surface and then defend to -104 feet?
A: 6 1/4 B: 11 2/9
C: 5 1/5 D: 11 9/20
I said C but it was wrong. how do i solve this then? what would the correct answer be?
(125 + 104) / 20 = ?
203 trust me its 203 :)
To solve this problem, you need to find the time it takes for the submarine to rise from -125 feet to the surface (0 feet), and then descend to -104 feet.
First, let's find the time it takes for the submarine to rise from -125 feet to the surface. The distance to be covered is 125 feet (from -125 to 0), and the submarine travels at a rate of 20 feet per minute. To find the time, we divide the distance by the rate:
Time = Distance / Rate
Time = 125 feet / 20 feet per minute
Time = 6.25 minutes
So, it takes the submarine 6.25 minutes to rise to the surface.
Next, let's find the time it takes for the submarine to descend from the surface (0 feet) to -104 feet. The distance to be covered is 104 feet (from 0 to -104), and the submarine stills travels at a rate of 20 feet per minute. Again, we use the same formula:
Time = Distance / Rate
Time = 104 feet / 20 feet per minute
Time = 5.2 minutes
So, it takes the submarine 5.2 minutes to descend to -104 feet.
To find the total time, we add the time it takes to rise and the time it takes to descend:
Total Time = Time to rise + Time to descend
Total Time = 6.25 minutes + 5.2 minutes
Total Time = 11.45 minutes
The correct answer is approximately 11 9/20 minutes, which corresponds to option D.