Home
Class 11
PHYSICS
A man can swim in still water at a speed...

A man can swim in still water at a speed of `4 kmph`. He desires to cross a river flowing at a speed of `3 kmph` in the shortest time interval. If the width of the river is 3 km , then time taken to cross river (in hours) and the horizontal distance travelled (in km) are respectively

A

`(3)/(4), (9)/(4)`

B

`(3)/(5),3`

C

`(1)/(4),(15)/(4)`

D

`(3)/(sqrt(7)), 7`

Text Solution

Verified by Experts

The correct Answer is:
A
`t=(d)/(V_(B), x=V_(W). (d)/(V_(B))`
Promotional Banner

Similar Questions

Explore conceptually related problems

A man can swim in still water at a speed of 4 kmph . He desires to cross a river flowing at a speed of 3 kmph in the shortest time interval. If the width of the river (in hours) and the horizontal distance travelled (in km) are respectively

A man can swim in still water at a speed of 6 kmph and he has to cross the river and reach just opposite point on the other bank.If the river is flowing at a speed of 3 kmph ,and the width of the river is 2km , the time taken to cross the river is (in hours)

A man can swim in still water at a speed of 5km//h . Man crosses 1 km width of river along shortest possible path in 15 minutes . What is the speed of river in km/h?

A man can swim at a speed of 5km//h in the still water. He wants to cross a 1600m wide river flowing at 4 km//h . He keeps himself at an angle 127^(@) with the river flow while swimming. (a) Find the time he takes to cross the river. (b) Find the distance traveled by him along the flow.

A boy can swim in still water at 1m//s . He swims across a river flowing at 0.6m/s which is 336 m wide. If the travels in shortest possible time, then what time he takes to cross the river?

A man can swim at a speed of 3 km h^-1 in still water. He wants to cross a 500-m wide river flowing at 2 km h^-1 . He keeps himself always at an angle to 120^@ with the river flow while swimming. The time taken to cross the river is.

A swimmer can swim in still water with speed v and the river is flowing with speed v//2 . What is the ratio of the time taken to swimming across the river in shortest time to that of swimming across the river over the shortest distance ?

A boat which has a speed of 6km/h in still water crosses a river of width 1 km along the shortest possible path in 20 min. the velocity of the river water in km/h is

A man who can swim at a velocity v relative to water wants to cross a river of width b, flowing with a speed u.

A man can swim at a speed of 3 km/h in still water. He wants t cross a 500 m wide river flowing at 2 km/h. He flow at an angle of 120 with the river flow while swimming. A. Find the time he takes to cross the river. b.At what point on the opposite bank will he arrive?