A boat can go at 8km/h in still water it was down stream for a distanc – InterviewSolution

1.

A boat can go at 8km/h in still water it was down stream for a distance of 30 km in 3 hours. Find the speed of the stream

Answer»

Answer:

14 km/hr

Step-by-step explanation:

$\frac{30}{x} - \frac{30}{x-8} = 3$

$\frac{30x - 240 - 30x}{x^{2} - 8 } = 3$

$240 = 3x^{2} - 24x$

$x^{2} - 8x - 80 = 0$

$x^{2} - 14x + 6x - 80 = 0$

$x(x-14) +6( x-14) = 0$

$(x+6)(x- 14) = 0$

x = 14 ( OMIT the negative VALUE )

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