1.

A man rows to a place 48 Km distance and back in 14 hours. He finds that he can row 4 Km with the stream in the same time 3 Km against the stream. The rate off the stream is?

Answer»

1 KMPH



Let be moves 4 km downstream in X Hours 

Then in SPEED downstream = Kmph 

Speed in upstream = 4/X Kmph 

==> 48/4/X + 48/3/X = 14 

==> 12X + 16X =14 

==> X = 1/2 

Speed in downstream = 8 Kmph 

Speed in up stream = 6 Kmph 

Then the RATE of stream = 1/2 (8 - 6) = 1 Kmph


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