# The boat in 1.4 hours passed across the current 2.2 km less, than in 1.7 hours against the current. Find watercourse speed if boat speed is equal in still water to 28 km/h. Who will solve ladies 34 points

Bandilune

86

Let x - watercourse speed, then (28th) - speed against the current the rivers, (28+ x) - speed on a watercourse. Let's work out the equation: (28+ x) *1.4 = (28th) *1,7 - 2,2 39,2 + 1.4kh = 47.6 - 1.7kh - 2.2 3.1kh = 6.2 x = 2 Answer: speed of the river is 2 km / ч1.4 * (28 + X) + 2.2 = 1.7 * (28 - X) 39,2 + 1,4X + 2,2 = 47,6 - 1,7X 1,4X + 41,4 = 47,6 - 1,7X 1,4X + 1,7X = 47,6 - 41,4 3,1X = 6.2 X = 2 (km/h) - watercourse speed the ANSWER of 2 km/h

146

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Boris

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