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?
+33616 Use speed = distance/time to find her initial speed = 100/5 = 20 mph
Hence speed in last part of the trip = v2 = 40 mph
Distance travelled in first part of trip = 100 miles
Distance travelled in second part of trip d2 = 300 - 100 = 200 miles.
Time taken for second part of trip = distance/speed = d2/v2 = 200/40 = 5 hours.
