Boats & Streams Mcqs


Q.  A man can row 9 1/3 km/hr in still water and he finds that is thrice as much time to row u p than as to row down the same distance in river. The speed of the current is:________?

a. 3 1/3 km/hr
b. 3 1/9 km/hr
c. 1 ¼ km/hr
d. 4 2/3 km/hr


ANSWER: See Answer
 
Let Speed upstream = x km/hr

Speed downstream = 3x km/hr

Speed in still water = ½ (x+3x) km/hr = 2x km/hr

Speed of current = ½ (3x-x) km/hr = x km/hr

2x = 28/3 or x = 14/3 = 4 2/3 km/hr
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