A man rows 750m in 775 seconds against the stream and returns in 7 1 2 minutes What is rowing speed ...........

Quantitative Aptitude ( CCS) Boats and Streams

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A man rows 750m in 775 seconds against the stream and returns in 7(1/2) minutes. What is rowing speed in still water ?

4.7km/hr

4km/hr

3.5km/hr

6km/hr

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Explanation:

Explanation:
Speed upstream ‘b’ = 750m / 775 sec = 30/31 m/sec
Speed downstream ‘a’ = 750 m/ (15/2)minutes [ 1min=60 sec] a = 750m/450 sec =5/3 m/sec
speed in still water = ½ (a+b)
= ½ (750/450 + 750/675 ) m /sec
= ½ (750/450 + 750/675 ) x 18/5 km/hr
= ½ (5/3 + 30/31) x 18/5 km/hr
= 4.7 km/hr

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