A Boat Can Travel 5.6 Km Upstream In 12 Minutes And 16.8 Km Downstream In 28 Minutes What Is The Speed Of The Boat In Still Water ? (In Kmph)
A boat can travel 5.6 km upstream in 12 minutes and 16.8 km downstream in 28 minutes What is the speed of the boat in still water ? (in kmph)
Let us take,
speed of river = x
speed of boat in still water = y
Speed of boat in upstream = (5.6/12)×60 kmph = 28 kmph
Speed of boat in downstream= (16.8/28)×60 kmph = 36 kmph.
In upstream, speed of river and boat cancels down to give total speed.
⇒x - y = 28
In downstream, speed of river and boat adds up to give total speed.
⇒x + y = 36
Add both equations
(x - y) + (x + y) = 28 + 36
2x = 64
x = 32
y = 36 - x = 36-32
y = 4
Speed of river = 32 kmph
Speed of boat in still water = 4 kmph
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