In a row, 25 trees are planted at equal distance from each other. The distance between 1st and 25th tree is 30m. What is the distance between 3rd and 15th tree?

Along a yard 225 metres long,26 trees are planted at equal distances,one tree being at each end of the yard.What is the distance between two consecutive trees? (a) 8 metres (b) 9 metres (c)10 metres quad (d) 15 metres

The distance between 4th and 3rd Bohr orbits of He^(+) is :

The distance between 4th and 3rd Bohr orbits of He^(+) is :

The distance between 4th and 3rd Bohr orbits of He^(+) is :

The distance between 4^(th) and 3^(rd) Bohr orbits of He^(+) is :

In a row of trees one tree is the 7th from either end of the row. How many trees are there in the row ?