Jean traveled the first 100 miles in 5 hours. Then she doubled her speed for the last part

of the trip. If the total trip was 300 miles, how many hours did it take Jean to travel the

last part?

Time taken to travel the last part by Jean is 5 hours.

Step-by-step explanation:

Step 1: Given the total distance = 300 miles. Part 1 distance = 100 miles and time = 5 hours. Find speed for the first part.

⇒ Speed = Distance/Time = 100/5 = 20 miles/hour

Step 2: Find the speed of the second part given that she doubled her speed.

⇒ Speed for second part = 2 * 20 = 40 miles/hour

Step 3: Find the time taken to cover the last part by using the speed formula used above.

⇒ Time = Distance/Speed = 200/40 = 5 hours

Answer:2hours and 30 minutes

Step-by-step explanation:If the first part of the trip (100miles) is 5hours. Then the second part of the trip (another 100miles) will be for 5hours too. The last part of the trip (the last 100miles to make up the 300 miles) will be for 2hours and 30 minutes since she doubled her speed for the last part of the trip.