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A swimmer can swim with a speed of 4 m/s in still water. He wants to cross a river of width 200 m, flowing with a speed of 2 m/s. If he wants to reach directly opposite to the starting point, at what angle with the downstream direction should he swim?
30°
60°
90°
120°
A boat takes 2 hours to travel 8 km and back in still water. If the velocity of the river is 4 km/h, the time taken by the boat to travel 8 km upstream and back is:
2 hours
2.5 hours
2.67 hours
3 hours
A boat attempts to cross a river flowing at 4 m/s. The boat's speed in still water is 3 m/s. The minimum drift experienced by the boat while crossing the river is:
0 m
Cannot be determined without the river width
4/3 times the width of the river
4 m
