A boat goes downstream and covers the
distance between two ports in 4 hours
while it covers the same distance
upstream in 5 hours. If the speed of the
stream is 2 kmph, what is the speed of
the boat in still water ?
(A) 15 kmph
(B) 20 kmph
(C) 24 kmph (D) 18 kmph
Answers
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Answer:
18 kmph
Step-by-step explanation:
Let the distance between two port be x
And speed of boat in still water be S
According to question,
In downstream,
x=(S+2)x4 ........(1)
(Distance= Speed x Time)
Similarly,
In upstream,
x=(S−2)x5 ........(2)
From (1) & (2),
(S+2)4=(S−2)5
=> 4S+8=5S−10
=> S=18 km/hr.
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