Question

A swimmer reaches the other bank of a flowing river exactly opposite to the starting point if he was swimming at 2km/hr while maintaining 150 °with the flow then time taken by him to cross the river 1km wide

Answer 1

Answer:

1 hr

Explanation:

A swimmer reaches the other bank of a flowing river exactly opposite to the starting point if he was swimming at 2km/hr while maintaining 150 °with the flow then time taken by him to cross the river 1km wide

swimming at 2km/hr while maintaining 150 °with the flow

Vertical Speed = 2Sin150° = 2Sin30° = 1 km/Hr

Horizontal Speed = 2Cos150° = -2Cos30° ( Cancel out the flow)

Now Vertical Speed = 1 km/Hr

Width = 1 km

Time Taken = 1/1 = 1 hr