Water in river is flowing with a u with respect to ground the velocity of boat with respect to still water is v. the boat travels certain distance in time t1 and the same distance upstream t2 .the time in which it travels same distance in still water
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Answer:
The correct option is A.
Letdistance=d
The angle made with the upstream=θ
Therefore,
90−θ=Angle made with the normal stream
Hence,
Shortest Time Method:
Time taken, t=
v
d
Shortest distance method:
Time taken = t'=
vcos(90−θ)
d
=
vsinθ
d
Therefore, required ratio
=
t
′
t
=
v
d
sinθ
v
d
=sinθ
Explanation:
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