Solve
-A Boat Moves 9 Kilometers Upstream in the Same $5 \frac { 5 } { 8 } \mathrm {~km} / \mathrm { hr }$

Solve.
-A boat moves 9 kilometers upstream in the same amount of time it moves 17 kilometers downstream. If the rate of the current is 5 kilometers per hour, find the rate of the boat in still water.

A) $5 \frac { 5 } { 8 } \mathrm {~km} / \mathrm { hr }$
B) $5 \mathrm {~km} / \mathrm { hr }$
C) $16 \frac { 1 } { 4 } \mathrm {~km} / \mathrm { hr }$
D) $19 \frac { 1 } { 8 } \mathrm {~km} / \mathrm { hr }$