A scuba diver is diving at the constant rate and her elevation is 18 feet below sea level. 8 seconds later he elevation is 20 feet below sea level. How many more seconds until she reaches 50 feet below sea level?
I believe it is 120. Since you need 30 more feet to reach 50 feet below sea level, you divide by 30/2 because every 8 seconds it drops 2 feet and multiply 15 by 8 .
