a diver needs to fix a gas line at the bottom...
a diver needs to fix a gas line at the bottom of the bay. his oxygen tank holds enough air for 120 minutes. the job will take 90 minutes. it will take 10 minutes to get to the to the site and 10 minutes to get back to the surface. how many minutes of air will he have left when he finishes the job and reaches the surface?
Answer
# Answer:
10 minutes
# Explanation:
## Step1: Calculate the total time needed for the dive.
The total time includes getting to the site, doing the job, and returning to the surface.
$$ \text{Total Time} = \text{Time to Site} + \text{Job Time} + \text{Time to Surface} $$
$$ \text{Total Time} = 10 \text{ minutes} + 90 \text{ minutes} + 10 \text{ minutes} $$
## Step2: Sum the times to find the total duration.
Add the time components together.
$$ \text{Total Time} = 110 \text{ minutes} $$
## Step3: Calculate the remaining air.
Subtract the total time needed from the total air available in the tank.
$$ \text{Air Left} = \text{Total Air Available} - \text{Total Time Needed} $$
$$ \text{Air Left} = 120 \text{ minutes} - 110 \text{ minutes} $$
## Step4: Perform the subtraction to find the final answer.
Calculate the difference.
$$ \text{Air Left} = 10 \text{ minutes} $$