Question

Both question Plzz answer

Answer 1

speed in still water is 18 km/hr
let speed of stream be x km/hr
so upstream = 18-x km/hr
downstream=18+xkm/hr
ATQ,
$\frac{24}{18 - x} = \frac{24}{18 + x} + 1 \\ \frac{24}{18 - x} - \frac{24}{18 + x} = 1$
by solving these equations we get the value of x are 6 and -54 ...so we take the speed of stream is 6 km/hr as speed can not be in negative value ...

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