A runner covers 3 km on the first day of training

MATHEMATICS · Subjective · CBSE · Mathematics · Arithmetic Progressions · Arithmetic Progressions

Problem

A runner covers 3 km on the first day of training. On the nth day, he covers 15 km. The total distance run in the first n days is 81 km. Determine: (i) the value of n, and (ii) the daily increase in distance.

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