# A deep-sea exploring ship is pulling up a diver at the rate of 25 feet per minute The diver is 200 feet below sea level. How deep was the diver 10 minutes ago?

Nov 3, 2016

Ten minutes ago, the diver was $450$ feet below sea level.

#### Explanation:

Since tge diver is being pulled up, measuring his movement for the past $10$ minutes requires that we use $- 25$ for the movement over those $10$ minutes. So, his depth $10$ minutes ago is given by the expression

$- 200 - 25 \left(10\right)$
$- 200 - 250$
$- 450$

So, $10$ minutes ago, the diver was $450$ feet below sea level.