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A man can swim with a speed of 4 "km h"^...

A man can swim with a speed of `4 "km h"^(-1)` in still water. How lonu does he lake lo Cross a river 1 km wide if the 0.81 in river flows steadily at `3 "km h"^(-1)` and he makes his strokes normal to the river current?

A

5 min

B

10 min

C

15 min

D

20 min

Text Solution

Verified by Experts

The correct Answer is:
C
Time to cross the river ,
`t = ("width of river")/("speed of man") = (1 km)/(4 km h^(-1))=1/4h = 15 min`
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