A Boat Goes 270 Miles Downstream in the Same Time $144 \mathrm{mph}$

Multiple Choice

A boat goes 270 miles downstream in the same time it can go 240 miles upstream. The speed of the current is 8 miles per hour. Find the speed of the boat in still water.

A) $144 \mathrm{mph}$
B) $51 \mathrm{mph}$
C) $136 \mathrm{mph}$
D) $128 \mathrm{mph}$