If a Submarine Goes $2 k^{3}+14 k^{2}+10 k-56$ Miles In $2 k+8$

Multiple Choice

If a submarine goes $2 k^{3}+14 k^{2}+10 k-56$ miles in $2 k+8$ hours, what is its rate of speed?

A) $\mathrm{k}^{2}+3 \mathrm{k}-7 \mathrm{mph}$
B) $\mathrm{k}^{3}+3 \mathrm{k}^{2}-7 \mathrm{kmph}$
C) $\mathrm{k}^{2}-3 \mathrm{k}+7 \mathrm{mph}$
D) $\mathrm{k}^{2}+11 \mathrm{k}-7 \mathrm{mph}$