There are 67 full rows.
There are 6 trees in the extra row.
67\6 is the fraction
The rate is 8.17 meters per second
Further explanation:
In order to find the rate we have to divide the distance covered by the woman by the time she covered it in.
Given

The rate is 8.17 meters per second
Keywords: Speed, distance
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Corresponding sides:
EF, HI
FG, IJ
EG, HJ
Corresponding angles:
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