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1 .


A man swims 21 km downstream and 14 km upstream, taking 7 hours each time. What is the speed of the stream?

[ A ]    2 kmph
[ B ]    1.5 kmph
[ C ]    1 kmph
[ D ]    $1 \over 2$ kmph right
[ E ]    None of these
Answer : Option D
Explanation :
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