Question

A man Travels by boat 36 km upstream and complete the distance in 8 hours if the speed of boat in still water is 12 km/he.find the speed of water current

Answer 1

$\color {red}\huge\bold\star\underline\mathcal{Question:-}$

we Have to Find speed of current ?

Given :- Distance He cover in upstream is = 36 km

and it has been said that he cover this distance in 8 hours .

$\bold{\boxed{\huge{\boxed{\orange{\small{\boxed{\huge{\red{\bold{\:Answer}}}}}}}}}}$

we know that ,

$speed = \frac{distance}{time} \\ \\ speed = \frac{36}{8} = 4.5km \: per \: hour$

and , we also know that

$in \: upstream \: speed = \\ \\ speed \: in \: still \: water - speed \: of \: current$

so,

$speed \: of \: current = 12 - 4.5 = 7.5$

so, speed of current is = 7.5km/h (Ans)

Answer 2

$\huge{\sf{\underline{\underline{AnSwEr:-}}}}$

$\large{\sf{\underline{\underline{SolUtion:-}}}}$

$\large\sf\therefore\green{Speed \: of \: Current \: Water = 7.5km/h }$

$\large{\sf{\underline{\underline{GivEn:-}}}}$

$\bullet$ Distance Covered = 36km/h

$\bullet$ Time Taken= 8hrs.

$\large{\sf{\underline{\underline{To \: FiNd:-}}}}$

$\bullet$Speed of Water current

$\large{\sf{\underline{\underline{STep \: bY \: sTeP \: expLanaTion:-}}}}$

As we know ;

$\large\red{\boxed{\sf Speed = \frac{Distance}{Time} }}$

$\large\sf\to\ Speed= \frac{36}{12} \\ \\ \large\sf\to\ Speed = 4.5km/h$

Now, Speed Of current Water:-

$\large\sf\to\ Speed \: oF \: current \: WaTer= 12 - 4.5 \\ \\ \large\sf\to\ 7.5 \: km/h$