Well, as it implies you can cover 60 km per hour driving at the speed of 60km. So if you drove for two hours, you could go 120 km.
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Time = Distance/Speed = 30 km/60km per hour = 1/2 hour or 30 minutes
60km per hour west.
For this question, we can look at an everyday example. I'm driving at 60km per hour. This means i am driving 60km every hour. Or, 60km over 1 hour (per=ontop of or over). So we can think of per-cent as per=over and cent=100. Century is 100 years. --Cent is latin for 100. So to answer your question 81 percent to a fraction, would have to be 81 (per) over 100. 81/100 = 0.81 = 81% we divide by 100.
Speed = Distance/Time = 60km/1.5h = 40 km per hour
22.5 miles.