# PHYSICS

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A girl rows 10 km downstream in 2 h. Her return trip takes 3 h. How fast is the current. in km/

• PHYSICS -

v = her speed
c = current speed
(v+c) * 2 = 10
(v-c) * 3 = 10

v + c = 5 = 15/3
v - c = 10/3
--------------subtract
2 c = 5/3
c = 5/6

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