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HP Calc

HP Calc

SOLVER TRAVEL EQUATIONS 95LX 100LX

I wrote these Solver equations during a seven hour drive. The first gives the drive time remaining, the second gives an ETA (Estimated Time of Arrival; 24-hour clock, 13.38 = 1:38 pm). Hope they're of use.

TRAVEL TIME

(FP(Miles/MPH)

*60/100)+

IP(Miles/MPH)

=Hrs.Min

TRAVEL ETA

If(IP(if(FP(((

FP(Miles/MPH)*60/100)+

IP(Miles/MPH))+

CTIME)>.60,((

FP(Miles/MPH)*60/100)+

IP(Miles/MPH))+

CTIME-.60+1,((

FP(Miles/MPH)*60/100)+

IP(Miles/MPH))+

CTIME))>24,if(FP(((

FP(Miles/MPH)*60/100)+

IP(Miles/MPH))+

CTIME)>.60,((

FP(Miles/MPH)*60/100)+

IP(Miles/MPH))+

CTIME-.60+1,((

FP(Miles/MPH)*60/100)+

IP(Miles/MPH))+

CTIME)-24,if(FP(((

FP(Miles/MPH)*60/100)+

IP(Miles/MPH))+

CTIME)>.60,((

FP(Miles/MPH)*60/100)+

IP(Miles/MPH))+

CTIME-.60+1,((

FP(Miles/MPH)*60/100)+

IP(Miles/MPH))+CTIME))

=ETA

These equations are found in TRAVEL.EQN (ON DISK) and work in HP Calc's Solver on either the 95LX or the 100LX. The second equation uses the time set on your Palmtop's internal clock, so make sure that it is accurate. The equation is complicated, but it works. If you have problems with it, double check your entry. It's easy to leave off a parenthesis.

Joe Reilly

CompuServe ID: [76470,3310]

iPhone Life magazine


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