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A man can row against the current three-...

A man can row against the current three-fourth of a kilometre in 15 min and returns same distance in10 min, then ratio of his speed to that of current is

A

`3:5`

B

`5:3`

C

`1:5`

D

`5:1`

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CHAMPION PUBLICATION-2010 TIER-II PAPER(24)-EXERCISE
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  14. 3/4(1+1/3)(1+2/3)(1-2/5)(1+6/7)(1-(12)/(13))=? 1/5 (b) 1/6 (c) 1/7 (d...

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