10
In the final and most common type of time-speed-
distance problem, the time and distance are known,
and you need to solve for unknown speed. The
rate arrow represents the answer. You will have
flown between two known ground reference points
26 NM apart and checked the time between them to
be: 13 (thirteen minutes, that is, not thirteen hours).
1. Set thirteen minutes on the middle scale op-
posite to 26 on the outer scale.
See
Figure 5.
2. The rate arrow points to your ground speed,
120 knots.
Try these time-speed-distance problems:
(Answers are on Page 37)
SPEED TIME DISTANCE
1. 125 KTS 524 NM
2. 2:30 345
3. 110 KTS 1:40
4. 0:24 44
5. 95 1:24
Figure 5
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