The range of speed for which the vehicle has stopping distance that do not exceed 240ft.
The range of speed is .
The formula for distance to stop the car is with the stopping distance 240ft or less, where d is the distance measured in feet (ft) and v is the speed of the car measured in mi/h.
Substitute the value of 240ft for d in and calculate the value of v as follows.
Since the stopping distance is 240ft or less, the formula will become . That is,
On further simplification,
Further solve the equation as follows.
Thus, and .
Since the speed cannot be negative, .
Therefore, the range of speed is .
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