If downstream speed of a boat is numerically equal to square of the upstream speed, what will be the maximum value of ratio of speed of boat to speed of stream such that speed of boat and stream are natural number and not equal.

If downstream speed of a boat is numerically equal to square of the upstream speed, what will be the maximum value of ratio of speed of boat to speed of stream such that speed of boat and stream are natural number and not equal.
1). 3 : 2
2). 3 : 1
3). 3 : 5
4). 4 : 7

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