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satish narayan chaudhary

· started a discussion

· 1 Months ago

we can use 2ab/a+b

Question:

A man can row at a speed of 5 km/hr in still water to a certain point and back to the starting point in a river which flows at 2 km/hr. The average speed of man for total journey is:

Options:
A) \(3\cfrac{1}{5}\)km/hr
B) \(4\cfrac{1}{6}\)km/hr
C) \(3\cfrac{1}{6}\)km/hr
D) \(4\cfrac{1}{5}\)km/hr
Solution:
Ans: (d) Let the distance be x km

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· commented

· 1 Months ago

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