23. A submarine is at a depth of 250 meters. If it ascends at a rate of 15 meters per minute, can it reach the surface in a half hour?

At a depth of 250 meters and ascending at a rate of 15 meters per minute, the submarine would rise 15 meters for each minute of ascent. In 30 minutes, it would ascend \(15 \times 30 = 450\) meters. Since 450 meters exceeds the 250 meters depth, the submarine can indeed reach the surface in half an hour. If you’re ever unsure about such calculations, keep in mind the key: Always break down the problem into smaller parts. Convert depth into manageable increments, just like counting your steps while walking to a destination. Plus, ensure to double-check your arithmetic—mistakes often hide in simple additions!