Question

A deep sea diving bell is being lowered at a constant rate. After 10 ​minutes, the bell is at a depth of 600 ft. After 40 minutes the bell is at a depth of 1 comma 700 ft. What is the average rate of lowering per​ minute? Round to the nearest hundredth.

Answer 1

Average rate of lowering per​ minute = 36.67 ft/min

Explanation:

After 10 ​minutes, the bell is at a depth of 600 ft

After 10 minutes

Depth of bell = 600 ft

After 40 minutes the bell is at a depth of 1,700 ft.

After 40 minutes

Depth of bell = 1700 ft

Time gap = 40 - 10 = 30 minutes

Depth fallen = 1700 - 600 = 1100 ft

We have

Depth fallen = Average rate of lowering per​ minute x Time gap

1100 = Average rate of lowering per​ minute x 30

Average rate of lowering per​ minute = 36.67 ft/min