A boat takes two hours to travel 8 km and back in still water. If the velocity of water 4 ${\rm{km}}{{\rm{h}}^{ - 1}}$, the time taken for going ups tream 8km and coming back is

Cannot be estimated with the information given

NEET UG PHYSICS MCQ: MOTION IN PLANE

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Application +4 | -1

A boat takes two hours to travel 8 km and back in still water. If the velocity of water 4

\mathrm{km}{\mathrm{h}^{ - 1}}

, the time taken for going ups tream 8km and coming back is

View answer and explanation

Correct option: B

2 h 40 min

Option B (2 h 40 min) is correct because the total time is the sum of the upstream and downstream travel times, calculated using relative velocities.

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\mathrm{\vec a}\,and\,\mathrm{\vec b}

\mathrm{\vec a}\,and\,\mathrm{\vec b}

\overrightarrow P \,\,.\,\,\overrightarrow Q = 0\,and\,\overrightarrow P \,\, \times \,\,\overrightarrow Q = 0

\overrightarrow Q \,and\,\overrightarrow R

\vec{A}=3 \hat{i}+4 \hat{j}

\vec{B}=6 \hat{i}+8 \hat{j}

A

B

\overrightarrow{\mathrm{A}}

\overrightarrow{\mathrm{B}}

{\cot ^{ - 1}}\left( 2 \right)