The speed of a boat along the stream is 12 km/h and against the stream is 8 km/h.The time taken by the boat to sail 24 km in still water is

The speed of a boat along the stream is 12 km/h and against the stream is 8 km/h.The time taken by the boat to sail 24 km in still water is
1). 2 hours
2). 3 hours
3). 2.4 hours
4). 1.2 hours

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