Question

hey mates answer this soon​

Answer 1

Answer:

you can take reference from this. The question is the same. but numbers are different.

Answer 2

Answer:

5 km/hr

Step-by-step explanation:

Let the speed of the stream = x km/hr

Let the speed of the stream = x km/hrSpeed of the boat in still water = 11km/hr

Let the speed of the stream = x km/hrSpeed of the boat in still water = 11km/hrSpeed of the boat downstream = (11 + x) Km/hr

Let the speed of the stream = x km/hrSpeed of the boat in still water = 11km/hrSpeed of the boat downstream = (11 + x) Km/hrSpeed of the boat upstream = (11 – x) Km/hr

According to question

$\frac{12}{11-x} + \frac{12}{11 - x} = 2 \times\frac{45}{60}$

$12( \frac{11 - x + 11 + x}{121 - x ^{2} } ) = \frac{11}{4}$

$\frac{12 \times 22}{121 - {x}^{2} } = \frac{11}{4}$

$12 \times 22 \times \frac{4}{11} = 121 - {x}^{2}$

$12 \times 2 \times 4 = 121 {x}^{2}$

$96 = 121 {x}^{2}$

$96 - 121 = - {x}^{2}$

$- 25 = - {x}^{2}$

$25 = {x}^{2}$

$\sqrt{25} = x$

$\binom{ + }{ - } 5 = x$

$hence \: the \: speed \: of \: stream \\ \: is \: 5km \hr$

$rejecting \: negative \: value \: because \: \\ speed \: cannot \: be \: in \: negative \: so \\ x = 5$