Cross-Multiplication Method of Finding Solution of a Pair of Linear Equations
A man can row...
Question
A man can row a boat at a speed of 254 mph in still water. If he takes 3 times as long to row a distance upstream as to row the same distance downstream, then find the speed of the stream (in mph).
A
1.125 mph
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B
2.125 mph
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C
4.125 mph
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D
3.125 mph
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Solution
The correct option is D 3.125 mph Let the speed of the stream be 'x' mph.
Speed of the boat upstream = Speed of rowing – Speed of the stream
Rate upstream=254–x
Speed of the boat downsteam = Speed of rowing + Speed of the stream
Rate downstream=254+x
Let's assume that the time taken in downstream and upstream is 1 hour and 3 hours, respectively.