A man can row 12 km/hr in still water. If the speed of the c

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A man can row 12 km/hr in still water. If the speed of the current is 3 km/hr, he takes 4 hours more in upstream than in the downstream. What is the distance (in km)?

[SSC MTS 21 September 2017 Shift 1]

A 30

B 45,

C 60,

D 90,