Agirl is swimming downstream. in still water she can swim at 2km/h and the river is flowing with her. she covered a distance of 12km in 2h 24 min. how fast was the stream flowing?

The speed of stream is 3 km/hr

Solution:

Given that girl is swimming downstream

To find: Speed of stream

In still water she can swim at 2km/h and the river is flowing with her

Speed in still water = 2 km/hr

She covered a distance of 12km in 2h 24 min

Distance = 12 km

time taken = 2h 24 min =

Therefore,

If the speed of a boat in still water is u km/hr and the speed of the stream is v km/hr, then:

Speed downstream = (u + v) km/hr

5 km/hr = 2 km/hr + v

v = 5 - 2

v = 3 km\hr

Thus speed of stream is 3 km/hr

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