self Maths Puzzle undefined

M=f,r=k,w=g,s=?

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self Other Question

A man can row 30 km upstream and 44 downstream in 10 hours. It is also known that he can row 40km upstream and 55 km downstream in 13 hours. find the speed of the man in still water. There are n bulbs in a circle, each bulb has one switch associated with it, on operating the switch, it toggles the state of the corresponding bulb as well as two bulbs adjacent to that one. Given all bulbs are in off state initially, give a plan to turn all bulbs on finally.

Note: n >= 1.