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The 'e' Equation

The shortest ...

Question

The shortest possible time required by the boat to cross the river will be:-

A

125 s e c

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B

250 s e c

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C

500 s e c

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D

\frac{250}{\sqrt{3}} s e c

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Solution

The correct option is A $125 s e c$

Shortest possible time will be when boat makes no angle with $A B$ i.e vertical speed is $2 m / s$ .
(Refer to Image)
$t = \frac{d i s t a n c e}{s p e e d}$
$= \frac{500 m}{4 m / s}$
$= 125 s e c$

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