# The motor boat passes on a watercourse in 6 hours as much how many against the current in 8 hours. Find boat speed if the speed of a watercourse of 3 km/h

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Let the speed of the boat x to km/h Then speed on a current (x +3) to km/h Speed against the current (x-3) to km/h the Way of the boat on a current in 6 hours be equal to a way of the boat against the current in 8 hours, means it is possible to work out the equation 6 * (x +3) = 8 * (x-3) the 6th +18=8kh-24 8kh-6kh =18+24 2nd =42 X=42รท2 X=21 of Answer: 21 km/h

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