A bus started out going 20 miles per hour on the highway. One hour later it drove 40 miles per hour on the freeway. How long did it take to go 140 miles? Is the correct answer 3.5 minutes.
No, 3.5 minutes is not the correct answer. Think about it.
Review the related questions below.
To find out how long it took for the bus to travel 140 miles, we need to determine the time it took for each part of the journey.
Let's first calculate the time it took for the first part of the journey, where the bus was traveling at 20 miles per hour. The formula to calculate time is distance divided by speed: time = distance / speed.
For the first part of the journey, the distance covered is 20 miles, and the speed is 20 miles per hour. Therefore, the time taken for the first part can be calculated as:
time_1 = 20 miles / 20 miles per hour = 1 hour.
Now, let's calculate the time for the second part of the journey where the bus was traveling at 40 miles per hour. The distance covered in this part of the journey is 140 miles - 20 miles = 120 miles (since the bus already covered the initial 20 miles in the first part of the journey).
Using the same formula, we can calculate the time taken for the second part:
time_2 = 120 miles / 40 miles per hour = 3 hours.
To find the total time, we need to add the time taken for each part: total time = time_1 + time_2 = 1 hour + 3 hours = 4 hours.
Therefore, the correct answer is not 3.5 minutes but 4 hours.