Question

what's it's answer???
how to solve it​

Answer 1

Answer :

option 2

Explanation:

A man will row directly across a flowing river if his resultant velocity or river flow and the manis along

OC

which is perpendicular to the river velcity u. Resultant velcity of man across the river is <br>

= √u² − u²

<br> Resultant velcity of man down the stram <br>

<br> If (S) is thedistance coverd in each case, then <br>

t1 = S/√u²- v² and t² = S/ u+v

t1 / t2 = u + v /√u² - v² = u + v/√(u-v) (u+v)

=√u+v /√u-v

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