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    Question

    A boat takes half the time to move a certain distance

    downstream than upstream. the ratio of the boat's speed in still water and that of the current is.
    A 5:7 Correct Answer Incorrect Answer
    B 1:4 Correct Answer Incorrect Answer
    C 3:1 Correct Answer Incorrect Answer
    D 6:5 Correct Answer Incorrect Answer

    Solution

    . Let the speed of boat in still water =B and speed of stream =S Speed in Downstream =B+S Speed in Upstream =B-S ATQ- B+S=D/T         … (1) B-S=D/2T        … (2) Solve Equation (1) and (2) B=3D/4T, S=D/4T B/S=3/1 B:S=3:1 Alternate – Downstreamupstream  T1:2 S2:1 Speed of B in still water(B)=(B+S)/2=3/2 Spped of stream(current)(S)=(B-S) =1/2 Ratio of B And S= 3:1

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