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xample 8. A boat travels 30 km up a river in the same time as it takes to travel 50 km down the sameer. If the current of water is 5 km per hour, what is the speed of the boat in stll water?

Answer»

Solution: let the speed of boat in upstream=(x-5)seed of the boat in downstream= (x+5)Formula used: speed= distance/ timeSolution:Upstream: 30/5=6 hrsDownstream : 50/5=10 hrsEquation is6(x+5)=10(x-5)6x+30=10x-5080=4x x=20Therefore the speed of the boat in still water is 20km/hr

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