there are 25 trees at equal distances of 5 metres in a line with a well, the distance of the well from the nearest tree being 10 metres.a gardener waters all the trees separately starting from the well and he returns to well sfter watering each tree to get water for the next.find the tatal distance the gardener will cover in order to water all the trees.

Assume that Gardner is standing near the well initially and he did not return to the well after watering the last tree.
 
Distance covered by Gardner to water 1st tree and return to the initial position = 10 m + 10 m = 20 m
Distance covered by Gardner to water 2nd tree and return to the initial position = 15 m + 15 m = 30 m
Distance covered by Gardner to water 3rd tree and return to the initial position = 20 m + 20 m = 40 m
∴Distances covered by the Gardner to water the plants are in A.P.
Here a = 20, d = 10
Distance covered to water 25th tree = 20 + (25 – 1) 10 = 20 + 240 =260
 
Total distance covered by the Gardner

Thus, the total distance covered by the Gardner is 2740m.

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