Question

A boatman can row 96 km downstream in 8 hr. If the speed of the current is 4 km/hr, then find in what time he will be able to cover 8 km upstream ?​

Answer 1

Answer:

hii

your answer is here !

Step-by-step explanation:

Speed in downstream = 96/8 = 12 kmph

Speed of current = 4 km/hr

Speed of the boatman in still water = 12 – 4 = 8 kmph

Speed in upstream = 8 – 4 = 4 kmph

Time taken to cover 8 km upstream = 8/4 = 2 hours.

$follow \: \: \: \: me$

Answer 2

$\large\underline\mathrm\red{≫ Given:-}$

• $\small\mathrm{A \: boatman \: can \: row \: 96 \: km \: downstream \: in \: 8 \: hr.}$

• $\small\mathrm{The \: speed \: of \: the \: current \: is \: 4 \: km/hr.}$

$\large\underline\mathrm\red{≫ To \: find}$

• $\small\mathrm{Time \: taken \: to \: cover \: 8 \: km \: upstream.}$

$\large\underline\mathrm\red{≫ Solution}$

• $\large\mathrm\red{ accourding \: to \: question}$

$\small\mathrm{⟹ A \: boatman \: can \: row \: 96 \: km \: downstream \: in \: 8 \: hr.}$

$\small\mathrm{⟹ Distance = 96km}$

$\small\mathrm{⟹ Time = 8hr}$

$\large\underline\mathrm\red{≫ speed = {distance}/{time}}$

$\small\mathrm{⟹ speed = {96}/{8}}$

$\small\mathrm{⟹ speed = 12 \: km/h}$

$\large\underline\mathrm\red{≫ Speed \: of \: boat \: in \: still \: water}$

$\small\mathrm{⟹ 12 - 4}$

$\small\mathrm{⟹ 8km/hr.}$

$\large\underline\mathrm\red{≫ Speed \: of \: upstream = speed \: of \: boat - speed \: of \: current.}$

$\small\mathrm{⟹ 8 - 4}$

$\small\mathrm{⟹ 4km/hr.}$

$\large\underline\mathrm\red{≫ Now, \: Time \: taken \: to \: cover \: 8km \: upstream }$

$\small\mathrm{⟹ 8/4}$

$\small\mathrm{⟹ 2hours.}$

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