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A man rows down a river 18 km in 4 hours...

A man rows down a river 18 km in 4 hours with the stream and returns in 10 hours. Consider the following statements :
1. The speed of the man against the stream is 1.8 km/hr.
2. The speed of the man in still water is 3.15 km/hr.
3. The speed of the stream is 1.35 km/hr.
Which of the above statements are correct ?

A

1 and 2 only

B

2 and 3 only

C

1 and 3 only

D

1, 2 and 3

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