There are 30 trees at equal distances of 5 metres in a line with a ...

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There are 30 trees at equal distances of 5 metres in a line with a well, the
P distance of the well from the nearest tree being 10 metres. A gardner waters
\( \mathrm{W} \) all the trees separately starting from the well and he returns to the well after watering each tree to get water for the next. Find the total distance the gardner will cover in order to water all the trees.
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