Use a stopwatch.
At 60 mph, you can drive 10 miles. At 30 mph, you can drive 5 miles.
30 minutes (mph= miles per hour)
3 hours 30 minutes at 60 mph
32 minutes 44 seconds.
Time = Distance/Time = 2/30 = 1/15 hours = 4 minutes.
At 30 mph, it takes 10 hours. At 60 mph, it takes 5 hours.
At 30 mph it takes 40 minutes to drive 20 miles.
About 35 miles.
1 hour.
17 hours 30 minutes.
One hour at 30 million mph