The total time taken by the boat to cover 108 km upstream and 114 km downstream in 18 hours. The speed of the boat and the speed of the stream is x + 4 km and x – 5 km/hr respectively. Find the speed of the stream.

1
7 km/hr
2
5 km/hr
3
3 km/hr
4
4 km/hr
5
6 km/hr

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