If 3 people can complete half of a job in 20 days, how long would it take for 12 people to do the complete job?
A. 8 days
B. 10 days
C. 20 days
D. 24 days

In the diagram, the ratio of ab to ae is (1/2) . what is the ratio of the length of to the length of ?

Anyone know? will mark brainliest if correct!

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour. what is the cyclist average rate for the round trip in miles per hour ?