A train 100 metre long meets a man going in opposite direction at 5 km/h and passes him in 7-1/5
seconds. The speed of the train is
40 km/h
45 km/h
36 km/h
52 km/h
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A person can swim in still water at 4 km/h. If the speed of water is 2 km/h, how many hours willthe man take to swim back against the current for 6 km.