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To row a certain distance upstream and downstreamtakes $$t_1$$ hours and $$t_2$$ hours respectively and speed of stream is 'y' km/h. Find speedin still water.
$$Â \left(\frac {t_1Â ^2 - t_2Â ^2} { 2y}\right) km/h $$
$$Â \left[\left(\frac {t_1Â Â - t_2 } { t_1Â + t_2}\right)Â y \right ]km/h $$
$$Â \left[ \frac{(t_1Â Â + t_2 ) 2y}{ ( t_1Â - t_2)} \right ]km/h $$
$$Â \left[ \frac{(t_1Â Â + t_2 )}{ ( t_1Â - t_2) }y \right ]km/h $$
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