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`        a  man can swim at 6 km/hour. The speed of a stream is 2 km/hour. How much time will the man take to swim 400m if(a) he is swimming with the stream?(b) he is swimming against the stream?`
2 years ago

Arun
23543 Points
```							Dear Student (a)if he is swimming with the stream, the resultant velocity = 6+2 = 8 km/hr = 8 * 5/18 = 20/9  m/secnowtime  = distance /speed = 400/ (20/9) = 180 sec = 3 minutes (b)if against the stream, resultant velocity = 6 – 2 = 4 km/hr = 4 * 5/18 = 10/9 m/sechence time taken  = 400 / (10/9) = 360 sec = 6 minutes RegardsArun (askIITians forum expert)
```
2 years ago
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Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions