Citizen AD2992-59P - 4-2. How to use the motor sports function; Calculation of time needed to reach a set distance; Calculation of speed

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How to use the motor sports function4-2.
[Calculation of time needed to reach a set distance]
Q : How long does it take for a vehicle travelling at a speed of 80km to travel 400km?
A : Align 80 of the outer scale with the SPEED INDEX“” of the inner scale.
Result: 5 Hours (5.00) of the inner scale correspondes to 40 of the outer scale.
[Calculation of speed]
Q : What is the speed of a vehicle travelling a distance of 180km for period 2 hours
and 30 minutes?
A : Align 18 of the outer scale with 2:30 of the inner scale.
Result: 72km can be determined by comparing the SPEED INDEX “” of the inner
scale and corresponding outer scale indications.