1.

A person can row in still water at the rate of 8 km/h. If it takes him thrice as long to row upstream as to row downstream then the speed of the stream is: (a) 2 km/h(b) 3 km/h(c) 4 km/h(d) 6 km/h

Answer»

Correct answer is: (c) 4 km/h

Let x be the speed of the stream

\(\therefore\) 8 +x = 3 (8-x)

\(\Rightarrow\) 4x = 16

\(\Rightarrow\) x = 4km/h



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