Answer:
2x = 20 meters
Explanation:
Let the distance between each seedling be "x"
Therefore the distance between the 3rd and the 5th seedling will be 2x
Hence if the total distance between the first and last seedling was 100 meters and 10 seedlings was planting, distance between each seedling will be =
100 ÷ 10 = 10 meters = "x"
Distance 3rd and 5th seedling will be = 2x = 20 Meters