A boat covers a distance of 30 km in a 2 hrs downstream. To cover the same distance upstream the boat takes 6 hrs. What is the speed of boat in still water?
12 km/hr
Incorrect Answer14 km/hr
Incorrect AnswerExplanation:
Take two variables, one for the speed of boat in still water (x) and other for the speed of stream (y).
Therefore, with speed = distance / time,
1.) x+y=30/2, x+y=15 ( for downstream)
2.) x-y=30/6, x-y=5 (for upstream)
adding (1.) to (2.)…
2 x =20, x=10
Hence, option 4 is the correct answer.
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By: Amit Kumar