Answer :

purplechocolate

Answer:

He has been descending for 4 hours.

Step-by-step explanation:

10 ft / 1 hr → 40 ft / 4 hr

You can think of this in terms of ratios. Another way to think about this is: After one hour passes, you descend 10 ft. Another hour passes, you descend 20 ft. So on so forth.

the answer is 4 hours lol

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