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Answer this plzzzzzzzzA stream flows from A to B a distance of 30 km.at 2 km/hr and a man can row up and down in 8 hrs . Find the rate of the man in still water . |
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Answer» Answer: Brainly.in What is your question? 1 Secondary School Math 5 points A stream FLOWS from A to B a distance of 30 km at the rate of 2km/h and a man can row up and down in 8 hours.find the SPEED of the man in still watet. Ask for details Follow REPORT by Huda1881 06.01.2019 Answers Me · Beginner Know the answer? Add it here! hemangmehta63 Virtuoso Answer: 8km/h Step-by-step explanation: Let the speed of man in still water be 'x'. Distance = 30km Speed of stream = 2km/h Speed = Dist./Time Time = Dist./speed 8hrs. = 30/x-2 + 30/x+2 8 = 30x + 60 + 30x - 60/x^2 - 4 8x^2 - 32 = 60x 0 = 8x^2 - 60x - 32 0 = 2x^2 - 15x - 8 0 = 2x^2 +x - 16x - 8 0 = x(2x + 1) - 8 (2x+1) 0 = (2x+1)(x-8) x = -1/2 ; x = 8 As speed can't be NEGATIVE, x = 8km/h. |
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