If the third term of an AP is 12 and the seventh term is 24, then the 10th term

If the third term of an AP is 12 and the seventh term is 24, then the 10th term is

2) In a certain AP, 5 times the 5th term is equal to 8 times the 8th term, then its 13th term is equal to

3) 1,8,15,22,29,36,… is

4) If the first term of an AP is 2 and common difference is 4, then sum of its first 40 terms is

5) 25 trees are planted in a straight line 5 metres apart from each other. To water them the gardener must bring water for each tree separately from a well 10 metres from the first tree in line with the trees. How far will he move in order to water all the trees beginning with the first if he starts from the well ?