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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
24738 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/sec
now
time  = 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/sec
hence time taken  = 400 / (10/9)
= 360 sec = 6 minutes

Regards
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