Tian measured her steps and found that it took her 625 steps to walk $500 \mathrm{~m}$. If she walks 10000 steps at this same rate, what distance will she walk?
(A) $6.4 \mathrm{~km}$
(B) $6.25 \mathrm{~km}$
(C) $7.5 \mathrm{~km}$
(D) $8 \mathrm{~km}$
(E) $7.2 \mathrm{~km}$
Tian travels $500 \mathrm{~m}$ every 625 steps and so she travels $500 \div 625=0.8 \mathrm{~m}$ with each step.

If Tian walks 10000 steps at this same rate, she will walk a distance of $0.8 \times 10000=8000 \mathrm{~m}$. Since there are $1000 \mathrm{~m}$ in each kilometre, Tian will walk $8000 \div 1000=8 \mathrm{~km}$.

ANSWER: (D)