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A swimmer whishes to cross a river 500 m...

A swimmer whishes to cross a river 500 m wide flowing at a rate 'u'. His speed with respect to still water is 'v'. For this, he makes an angle `theta` with the perpendicular as shown in the figure.

For u = 5 `km//hr and ` v=3km//hr`, the swimmer :

A

Can reach B in 7.5 min.

B

Can reach B in 6 min.

C

Can reach B in less than 6 min

D

Can never reach B

Text Solution

Verified by Experts

The correct Answer is:
D
`"For "u_(B//R)ltu_(R)`
Minimum drift can't be zero.
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