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I'll let you figure it out. Multiply 850 by 60. Multiply that by 60. Sorry but you should already know how to do that. This should have said divide by, not multiply by! There are 3600 seconds in an hour. A speed of 850 miles per hour is 850/3600 miles per seconds = 0.23611 miles per second, which is just slightly less than one quarter mile per second.
The speed appears to be 400 miles an hour. If you meant 400 miles, the speed is 50 miles an hour.
That speed is described as "fifty miles per hour".
100 miles/50 seconds= 2 miles per second average speed
The idea is to divide the distance by the time. Since presumably you want the answer in miles/hour, you should first convert the minutes to hours.