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Textbook Pg 60. Question #13

**Question: ***A submarine was cruising at a depth **153 m. It then rose at **4.5 m/min for 15 min.*** **
**A) ***What was the submarine's depth at the end of this rise? *

First you take 4.5m/min and multiply it by 15 minutes.
Then you take the depth of the submarine which is 153 m and subtract 67.5 m to get the submarine's depth at the end of the rise.

The submarine's depth at the end of the rise was **85.5 m.**** **
**B) ***If the submarine **continues to rise at the same rate, how much longer will it take to reach the surface? *
To get how much longer it will take if the submarine continues to rise and reach the surface, you take the submarine's last depth which was 85.5 m and divide it by its first depth which was 4.5 m/min to get how many minutes it took to reach the surface.
4.5x10=45
85.5x10=855
It took **19 minutes **for the submarine to reach the surface.
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