Question

Lindbergh's Air Speed Charles Lindbergh estimated that at the start of his historic flight the practical economical air speed was 95 mph and at 4000 statute miles from the starting point it was 75 mph (www.charleslindbergh.com). Assume that the practical cconomical air speed S is a linear function of the distance D from the starting point as shown in the accompanying figure. Find a formula for that function.

Answer 1

The function based on the information will be S = -0.005D + 95.

How to illustrate the function?

It should be noted that d is the distance from the starting point while S is the speed.

The points given are (0 95)( 4000, 75).

Slope = (75 - 95)(4000 - 0)

= 0.005

The equation will be:

S = -0.005D + 95

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