Arithmetic, Distance and Speed Problems, Fractions and Ratios, Geometry, Roots, Work and Rates Problems

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A \(100\) meter wide river can be crossed straightly, in \(4\) minutes when there is no stream and \(5\) minutes when there is stream. What is the speed of the stream?

A. \(10\) meter/minute
B. \(15\) meter/minute
C. \(20\) meter/minute
D. \(5\) meter/minute
E. None

The OA is B
Source: — Problem Solving |