0
If you drive one mile at 30 mph and one mile at 40 mph what is your average speed for the two miles?
Wiki User
∙ 11y ago
While this seems straightforward by taking the average between 30 and 40 (35 mph), the answer is more complex, because LESS TIME is spent driving at the FASTER speed than at the SLOWER speed.
Using only Englishmeasurements, the average speed is computed as the formula Va= (d1+d2)/ (t1 + t2):
1 mile at 30 mph - time is 1/30 hour or 2 minutes.
1 mile at 40 mph - time is 1/40 hour or 1.5 minutes.
Total distance traveled = 2 miles
Total time elapsed = 3.5 minutes
Average speed = 2 miles / (3.5 minutes) = .5714 miles per minute = 34.3 mph
--------
If the question had been phrased as "one MINUTE at 30 mph and one MINUTE at 40 mph", then the answer would indeed be the obvious average speed of 35 mph.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
Average speed for a four minute mile?
A 4-minute mile means an average speed of 15 miles per hour.
What is the average speed of a 14 minute mile?
This is an average speed of 4.3 miles per hour.
If a 180-Mile drive took 3 hours what was their average speed?
177
If it takes 4.68 seconds to drive 1 mile what is the speed in miles per hour?
192.307692 mph
What is the average speed to run a mile in 12 minutes?
5 mph (miles per hour)
If you drive 12 mile in 25 minutes how many miles per hour is this?
This is an average speed of 28.8 mph
If you drive one mile at 30 mph how fast do you have to drive the second mile if you have to average 60 mph for the two miles?
Yes, you can. If the average speed for the first mile is 30 mph, and the average speed for the second mile is 90 mph, then 30+90=120/2=60. You need to solve the equation for average speed, not time. You can't. 1 mile @ 30mph = 2 minutes 60 mph for 2 miles = 2 mintes thererfore you cannot go fast enough (or you could go infinity mph)
Average speed for a four minute mile?
A 4-minute mile means an average speed of 15 miles per hour.
What is the average speed of a 14 minute mile?
This is an average speed of 4.3 miles per hour.
If you run one mile drive ten miles and travel sixty miles by boat what is your average speed if each activity took 2 hours?
The average speed is determined only by the total distance traveled and the total time. Thus, the average speed is: (1+10+60) / 6 = 11.83 mph
Jenna finished a 2 mile race in 15 minutes what was her average speed in miles per hour?
Jenna's average speed was 8 miles per hour.
How many miles per minute for 15 minute mile?
A 15-minute mile equates to an average speed of 0.067 miles per minute.
At an average speed of 60 mph how long wll it take you to drive 375 miles?
1 hour = 60 minutes60 miles / hour = 60 miles / 60 minutes = 1 mile / minute375 miles ---> 375 minutes = 6hours15minutes
How fast is a 14 min mile?
A 14-minute mile equates to an average speed of 4.3 miles per hour.
How many miles per hour is a 12.58 min mile?
This is an average speed of 4.77 miles per hour.
If a 180-Mile drive took 3 hours what was their average speed?
177
What speed to drive one mile?
You can drive a mile at any speed, as long as you have enough time to do so.
