Question

A submarine was cruising at 1,328.4 feet below sea level. It then rose at a rate of 14.76 feet per minute for 15 minutes. Find the submarines depth after it rose for 15 minutes.

Answer 1

New depth = 1,107 feet

Explanation:

1) Let us first calculate the total number of feet the submarine rose in 15 minutes using the rate of rise.

rate = 14.76 feet per minute

This means that at every minute, the submarine rose by 14.76 feet.

1 minute = 14.76 feet

∴ 15 minutes = 14.76 × 15 = 221.4 feet

2) To find the new depth, we will subtract the number of feet risen from the initial depth.

initial depth = 1,328.4 feet

rise after 15 minutes = 221.4 feet

New depth = 1,328.4 - 221.4 = 1,107 feet