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Rashid [163]
3 years ago
12

A girl 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?
History
1 answer:
allochka39001 [22]3 years ago
4 0

The speed of stream is 3 km/hr

<em><u>Solution:</u></em>

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 = 2 + \frac{24}{60} = 2.4 hours

Therefore,

speed = \frac{distance}{time}

speed downstream = \frac{12}{2.4} = 5 \text{ kilometer per hour }

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

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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