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A boat takes 2 hours more to travel 45 k...

A boat takes 2 hours more to travel 45 km upstream than to travel the same distance downstream. If the ratio of the speed of current to the speed of boat is 1 ∶ 4, then find the speed of the current.

A

`5km//hr`

B

`9km//hr`

C

`4km//hr`

D

`3km//hr`

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