A boat goes downstream covers the distance between two ports in 96 minutes.While it covers the same distance upstream in 120 minutes,if the speed of the stream is 1 km/hr.Find the speed of boat in still water.
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Answered by
54
Let speed of boat be X kmph.
down stream- in 96 minute boat will travel 96/60(X+1)km
upstream -in 120 min boat will travel 120/60(X-1)km
As per question 96/60(X+1)=120/60(X-1)
⇒96 X+96=120X-120
⇒ 24X= 216
X=9
Speed of boat 9 kmph
down stream- in 96 minute boat will travel 96/60(X+1)km
upstream -in 120 min boat will travel 120/60(X-1)km
As per question 96/60(X+1)=120/60(X-1)
⇒96 X+96=120X-120
⇒ 24X= 216
X=9
Speed of boat 9 kmph
Answered by
11
it is nine because 96-120is 24 and iy divides by 4
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