Final answer:
To estimate the number of miles Jenna drove, we calculated the distance based on her constant speed of 80 kilometres/hour for 5 hours, resulting in a total of 400 kilometres. After converting this to miles, we found that Jenna drove approximately 248.5 miles in 5 hours.
Step-by-step explanation:
To estimate the number of miles Jenna drove in 5 hours, we need to make use of the fact that she was driving at a steady speed. Given the detail that she drove 40 kilometres home from a party at a constant speed of 80 kilometres/hour, we can calculate the total distance she would cover in 5 hours at that rate.
First, let's convert 5 hours into minutes so it matches the units we've been given for her trip from the party. There are 60 minutes in an hour, so 5 hours is equal to 300 minutes.
Since Jenna was driving at a speed of 80 kilometres/hour, we can use the formula:
Distance = Speed × Time
Substitute the speed and time with Jenna's details:
Distance = 80 km/hour × 5 hours = 400 kilometers
Since the question asks for the distance in miles, we need to convert kilometres to miles using the conversion 1 kilometre is approximately 0.621371 miles:
Distance in miles = 400 kilometers × 0.621371 miles/kilometer ≈ 248.5484 miles
Therefore, a reasonable estimate for the number of miles Jenna drove in 5 hours is approximately 248.5 miles.