8. The speed of a boat in still water is 15 km/h and the speed of a stream is 5 km/h. Find the
time taken by the boat to cover (i) 40 km upstream (ii) 36 km downstream,
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Let the speed of the stream be x km/h. It is given that the speed of a boat in still water is 15 km/h. Since speed can not be negative, therefore, x = 5. Thus, the speed of the stream is 5 km/h.
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