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 >.< ):
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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Your work seems alright to me, @aroub . There seems to be a problem with the given answer. Could that be a printing error or something?
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