Wipro Company Numerical Ability Time and Work

Rishi Kapoor can swim a certain course against the river flow in 84 minutes; he can swim the same course with the river flow in 9 minutes less than he can swim in still water. How long would he take to swim the course with the river flow?

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Wipro Other Question
Arun, Barun and Kiranmala start from the same place and travel in the same direction at speeds of 30, 40 and 60 km per hour respectively. Barun starts two hours after Arun. If Barun and Kiranmala overtake Arun at the same instant, how many hours after Arun did Kiranmala start? If 20 men take 30 days to complete a job. In how many days can 25 men complete the job?
a)28 days
b)24 days
c)36 days
d)20 days