Average speed: Bill and Amy want to ride their bikes from their neighborhood to school which is 14.4 kilometres away. It takes Amy 40 mins to arrive at school. Bill arrives 20 mins after Amy. How much faster(in meters/second) is Amy's average speed for the entire trip?
See previous post: Tue. 9-2-14, 6:17 PM.
To find the average speed, we need to calculate the total time taken and total distance traveled by each person.
Amy took 40 minutes to travel a distance of 14.4 kilometers from their neighborhood to school. To calculate Amy's average speed, we first convert the time from minutes to hours:
Time taken by Amy = 40 minutes = 40/60 = 2/3 hours
Now, we can calculate Amy's average speed using the formula:
Average Speed = Total Distance / Total Time
Amy's Average Speed = 14.4 kilometers / (2/3) hours
Since the question asks for the answer in meters/second, we will convert the values for distance and time as follows:
1 kilometer = 1000 meters
Amy's Average Speed = (14.4 kilometers * 1000 meters) / (2/3 hours * 60 minutes * 60 seconds)
Now, let's calculate the numerator first:
14.4 kilometers * 1000 meters = 14,400 meters
And the denominator:
2/3 hours * 60 minutes * 60 seconds = 2/3 * 60 * 60 = 2 * 60 = 120 seconds
Amy's Average Speed = 14,400 meters / 120 seconds
Amy's Average Speed = 120 meters/second
Therefore, Amy's average speed for the entire trip is 120 meters/second.
To answer your original question, since we don't know Bill's average speed, we cannot determine how much faster Amy's average speed is compared to Bill's.