A scuba diver descends 10 ft in an hour.
If he is at -40 feet, how many hours has he been descending?


  1. 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.


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