The speed of a boat in still water is 500% more than the spe

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The speed of a boat in still water is 500% more than the speed of the current. What is the respective ratio between the speed of the boat downstream and speed of the boat upstream ?

[SBI Clerk 29 may2016]

A 9 : 2

B 7 : 3

C 7 : 5

D 9 : 4

E 4 : 3