You are standing at the edge of a river which is 1 km wide. You have to go to your camp on the opposite bank . The distance to the camp from the point on the opposite bank directly across you is 1 km . You can swim at 2 km/hr and walk at 3 km-hr . What is the shortest time you will take to reach your camp?(Ignore the speed of the river and assume that the river banks are straight and parallel). calculusnumber theory theorems