For exercises 71-73, use the following information.

The First Transcontinental Railroad was built by two companies. The Central Pacific began building eastward from Sacramento, California, while the Union Pacific built westwards from Omaha, Nebraska. The two lines met at Promontory, Utah, in 1869, about 6 years after construction began.

Why do you think the Union Pacific was able to lay track so much more quickly than the Central Pacific.

The average number of miles of track laid by Central Pacific Company is $9.6$miles of track per month.

The average number of miles of track laid by Union Pacific Company is $15.0527778$miles of track per month.

Therefore, the Union Pacific Company was able to lay track so much more quickly than the Central Pacific Company

The Union Pacific Company was able to lay track so much more quickly than the Central Pacific Company due to two possible reasons:

1. Highly advanced machines
2. More manpower

The Union Pacific Company was able to lay track so much more quickly than the Central Pacific Company because either the Union Pacific Company is using highly advanced machinery than the Central Pacific Company or the Union Pacific Company is having more manpower than the Central Pacific Company.