The effective speed of a boat travelling downstream is 20 kmph, whereas it is 10 kmph upstream. What is the speed of the stream current in kmph?
The effective speed of a boat travelling downstream is 20 kmph, whereas it is 10 kmph upstream. What is the speed of the stream current in kmph? Correct Answer 5
ধরি, নৌকার বেগ x km/hrস্রোতের বেগ y km/hr <math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>∴</mo></math><math xmlns = "http://www.w3.org/1998/Math/MathML"><mstyle displaystyle = "false"><mfrac><mstyle displaystyle = "true"><munderover><mrow><mi>x</mi><mo> </mo><mo>–</mo><mo> </mo><mo> </mo><mi>y</mi><mo> </mo><mo> = </mo><mo> </mo><mo> </mo><mn>10</mn><mo> </mo><mo> </mo></mrow><mrow><mo>(</mo><mo> - </mo><mo>)</mo><mo> </mo><mo>(</mo><mo> + </mo><mo>)</mo><mo> </mo><mo>(</mo><mo> - </mo><mo>)</mo><mo> </mo></mrow><mrow><mi>x</mi><mo> </mo><mo> + </mo><mo> </mo><mi>y</mi><mo> </mo><mo> = </mo><mo> </mo><mn>20</mn><mo> </mo><mo> </mo></mrow></munderover></mstyle><mrow><mo>[</mo><mo>(</mo><mo>–</mo><mo>)</mo><mo> </mo><mi>ক</mi><mtext>রে</mtext><mo>]</mo><mo> </mo><mn>2</mn><mi>y</mi><mo> </mo><mo> = </mo><mo> </mo><mn>10</mn><mo> </mo><mo> </mo></mrow></mfrac></mstyle></math><math xmlns = "http://www.w3.org/1998/Math/MathML"><mo>∴</mo></math> y = 5