Usa test prep gretel is traveling from chicago to atlanta. her average speed for the trip (including stops) is 60 mph and she arrives at 10: 00 pm. how many miles did gretel travel? what additional piece of information will allow us to determine how far gretel traveled? a) the time she left chicago b) the distance from chicago to knoxville c) the number of hours she stopped for breaks d) her average speed for the first half of the trip

The time she left Chicago ⇒ answer A

Step-by-step explanation:

* Lets explain the meaning of average speed

- The definition of the average speed is the average speed of an

  object is defined as the distance traveled divided by the time elapsed

- That means the average speed of a trip is total distance of the trip

  divided by the total time of the trip

- Total times means the time of the movement and breaks

* Lets solve the problem

- Gretel is traveling from Chicago to Atlanta

- Her average speed for the trip (including stops) is 60 mph

- She arrives at 10:00 pm

∵ The rule of average speed = total distance/total time

- Find the distance she traveled lets rearrange the formula

- Multiply the both sides of the formula by total time

∴ Total distance = average speed × total time

∵ average speed = 60 mph

∴ We need the total time

- The total time of her trip is the difference between the arrival time

  and the departure time

∵ She arrives Atlanta at 10:00 pm

∴ We know the arrival time

∴ We need to know the departure time from Chicago

∴ The additional piece of information will allow us to determine how

   far  Gretel Traveled is the time she left Chicago

this answer is !