SOLUTION: It took a crew 1 h 12 min to row 1 km upstream and back again. If the rate of flow of the stream was 2 km/h, what was the rowing speed of the crew in still water? thanks...

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Question 756486: It took a crew 1 h 12 min to row 1 km upstream and back again. If the rate of flow of the stream was 2 km/h, what was the rowing speed of the crew in still water?
thanks...
Answer by nihar*2013(34) (Show Source):
You can put this solution on YOUR website!
I am answering this assuming that while coming back it is downsteam
Suppose rowing speed is x km/hr
Flow of stream is 2km / hr
1/x-2 + 1/x+2 =72
x+2+x-2=72(x+2) (x-2) [taking LCM]
x+x= 72 (x^2-2x+2x-4)
2x=72 (x^2+4)
2x= 72x^2-288
0 = 72x^2-2x-288
0 = 2 [36x^2-x-144]
hay it is half of the way accoding to me solution shld be like this do u hv answer for this i think there may be mistake inb question plz recheck the question and tell me if q is perfect tell me answer i will solve further for u thanks