A boat takes 6 hours to go downstream and upstream a certain distance. It takes 4 hours to travel twice the distance downstream. Which of the following is the ratio of the speed of the boat in still water to the speed of the river?
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Shortest way, please. Can we use any trick to get the answer in shortest time?
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I know how to solve it in neat. All I want is the trick!! :)
Here is my logic
let x is the speed of the boat
y is the speed of the water
then the speed of downstream is x +y
upstream is x-y
Let D is distance of the stream, hence
Solve the system. we can get the answer.