It takes a boat going upstream 3 hours to cover the same distance, as it would cover in 2 hours going downstream. What is the speed of the boat if the speed of the current is 3 kilometers per hour?

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  1. 3 (b - 3) = 2 (b + 3)

    3 b - 9 = 2 b + 6

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  2. d = (Vb-Vc)*T1 = (Vb+Vc)*T2
    (Vb-3)*3 = (Vb+3)*2
    3Vb-9 = 2Vb+6
    Vb = 15 km/h.

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  3. 15 km

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