Adeep sea diving bell is being lowered at a constant rate. after 12 minutes, the bell is at a depth of 400 ft. after 50 minutes the bell is at a depth of 2 comma 000 ft. what is the average rate of lowering per minute? round to the nearest hundredth.

After 50 minutes the bell is at a depth of 2000 ft so we can find the average rate by

2000/50 =40 ft per minute.

We ignore the 400 ft in 12 minutes because that is included when we take out the average at 50 minutes and adding it in would be an error of doubly entry.

Explanation: