A Jet Ski Can Go 12 Mph in Still Water $1 \frac { 1 } { 17 } \mathrm { hr }$

Multiple Choice

A jet ski can go 12 mph in still water. If a rider goes upstream for 5 hours against a current of 5 mph, how long will it take the rider to return? ( Hint: Upstream speed is (12 - 5) mph; how far can the rider go in 5 hours?
)

A) $1 \frac { 1 } { 17 } \mathrm { hr }$
B) $3 \frac { 1 } { 17 } \mathrm { hr }$
C) $2 \mathrm { hr }$
D) $5 \mathrm { hr }$
E) $2 \frac { 1 } { 17 } h$