John took half an hour to row 3 km with the current. When he returned, he took 90 min. Find his rowing rate and speed of the current.
This is my solving (but wrong >.< ):
3=30r+30t
3=90r-90t
=> Eq1+1/3(Eq2)
3=30r+30t
1=30r-30t
-----------
4=60r
r=4/60 and then you substitute r in any of the equations to find t, but r is supposed to be 4 O.o

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I really don't think so.. Because my teacher AND the book answered it r=4 and t=2

Multiply it by 60 ... get you answer is 4 km/hr
that's all right

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