I'm guessing that the answer they're looking for here is that as the speed increases the wind resistance increases more. This means that if you want to go 10 % faster maybe your fuel consumption will increase with 15%. Staying below the speed where wind resistance really begins to hurt lets you get away with using less fuel, which is better for the environment.
30 feet
It will take about 30 minutes of total driving time at a constant 30 mph. Add some time for stops or delays.
30 mph, as a mile is longer than a kilometer.
Most cars can stop from 60 mph in about 100 feet or so. If the relationship is linear then a car should stop from 30 mph in about 50 feet.
This is a very situational event. What are you driving? Are you wearing a helmet. There have been people who have rolled cars at 300 mph and lived. But there are people who have rolled cars at 30 mph and died.
30% is the dvla answer
How fast will you be driving? At 60 mph it will take 30 min. At 30 mph it will take 1 hour.
30 to 35 mph.
10 miles.
Wheel bearing.
It's theoretically possible. The maximum speed for a dog or cat is around 30 mph.
30 feet
It will take about 30 minutes of total driving time at a constant 30 mph. Add some time for stops or delays.
30 mph, as a mile is longer than a kilometer.
It would take 30 minutes driving at 30 MPH.
46 minutes.
From Laredo, Texas to Mexico it would take less than 1 minute.