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A man can row upstream at 12km/hr and downstream at 18 km/hr. The man rowing speed in still water is?

115 km/hr
25 km/hr
33 km/hr
410 km/hr

Answer:- 1

Explanation:-

Solution:

\begin{aligned} Speed of boat in still water \\ = \frac{x + y}{2} \\ Where x =  downstream speed \\ and y =   upstream speed \\ Boat's speed \\ = \frac{18 + 12}{2} \\ = \frac{30}{2} \\ = 15 k m / h r \end{aligned}

$\eqalign{ & {\text{Speed of boat in still water}} \cr & {\text{ = }}\frac{{x + y}}{2} \cr & {\text{Where }}x{\text{ = downstream speed}} \cr & {\text{and }}y{\text{ = upstream speed}} \cr & {\text{Boat's speed}} \cr & {\text{ = }}\frac{{18 + 12}}{2} \cr & = \frac{{30}}{2} \cr & = 15\,km/hr \cr}$

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", "dateCreated": "7/24/2019 10:09:12 AM", "author": { "@type": "Person", "name": "Nitin Sir" } }, "suggestedAnswer": { "@type": "Answer", "text": "

Solution:

\begin{aligned} Speed of boat in still water \\ = \frac{x + y}{2} \\ Where x =  downstream speed \\ and y =   upstream speed \\ Boat's speed \\ = \frac{18 + 12}{2} \\ = \frac{30}{2} \\ = 15 k m / h r \end{aligned}

$\eqalign{ & {\text{Speed of boat in still water}} \cr & {\text{ = }}\frac{{x + y}}{2} \cr & {\text{Where }}x{\text{ = downstream speed}} \cr & {\text{and }}y{\text{ = upstream speed}} \cr & {\text{Boat's speed}} \cr & {\text{ = }}\frac{{18 + 12}}{2} \cr & = \frac{{30}}{2} \cr & = 15\,km/hr \cr}$ ", "dateCreated": "7/24/2019 10:09:12 AM" } }

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