A biker increased his average speed by $10$ miles per hour in each successive $10$-minute interval after the first

A biker increased his average speed by $10$ miles per hour in each successive $10$-minute interval after the first interval. If in the first $10$-minute interval, his average speed was $30$ miles per hour, how many miles did he travel in the fourth $10$-minute interval?

A. $4$
B. $5$
C. $8$
D. $10$
E. $15$

OA D

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