Question

Based on Relative Motion
38. Water of a river is flowing with a speed of 5 km/hr. A swimmer can swim at a speed of 10 km/hr in still water. In what direction the swimmer starts swimming in the river so as to cross the river: (i) by least possible path (ii) in least possible time?
39. A man is moving with a speed of 4 km/hr towards north. The rain is falling at a speed of 6 km/hr in the vertical downward direction. To protect himself from the rain in which direction should he tilt his umbrella ?
40. Car A and B are moving on a straight road with speed 120km/hr and 100km/hr respectively. What is velocity of car A relative to car B. When: (1) Car A is moving in north direction and car B in south
direction. (ii) Both cars are moving in north direction.
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Answer 1

Answer:

my physics is so week please help me