Solve
-Julie and Eric Row Their Boat (At a Constant $3 \mathrm { mph }$

Multiple Choice

Solve.
-Julie and Eric row their boat (at a constant speed) 60 miles downstream for 6 hours, helped by the current. Rowing at the same rate, the trip back against the current takes 10 hours. Find the rate of the current.

A) $3 \mathrm { mph }$
B) $1.5 \mathrm { mph }$
C) $8 \mathrm { mph }$
D) $2 \mathrm { mph }$