Divided x²-21 by x-7
1 answer:
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A train needs 4 hours to go from the first station to the second and the total travel time must be no more than 7 hours, then the train needs at most 3 hours to go from the second station to the third station.
The average speed can be obtained by the formula:
Let V be the train speed between first and second stations, then the distance between the first and the second stations is 4V miles.
Therefore,
- the total distance is 4V+120 (V>0);
- the total time is T≤7 hours.
Now
The slowest average speed will be when nominator is the smallest and denominator is the greatest. The greatest denominator could be T=7, then