Final answer:
A pipefitter will need 36 lengths of 21' stainless steel pipe to span a horizontal tunnel distance of 756 feet.
Step-by-step explanation:
The student's question pertains to the number of lengths of 21' stainless steel pipe needed for a pipefitter to connect two tanks separated by a tunnel with a horizontal run of 756 feet. To solve this, we need to calculate the total number of lengths required to span the entire horizontal distance.
First, we must convert the distance into the same units for consistency. Since the pipe lengths are given in feet (21'), the horizontal run should be in feet as well. The given horizontal distance is already in feet, so no conversion is necessary.
Next, divide the total horizontal distance by the length of a single pipe segment to find the total number of pipe lengths required:
- Total horizontal distance: 756 feet
- Length of one pipe: 21 feet
- Number of pipes needed: 756 feet / 21 feet per pipe = 36 pipes
Therefore, the pipefitter will need 36 lengths of 21' stainless steel pipe to complete the installation between the two tanks.