a motor boat goes downstream and covers a distance in 4 hours while it covers the same distance upstream in 5 hours. if the speed of the stream is 3 km/hr,find the speed of the motor boat in still water
Answers
Answered by
7
Let the distance between two port be
′
x
′
km.
And speed of boat in still water be
′
S
′
km/hr.
According to question,
In downstream,
x=(S+2)x4 ........(1) as, (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.
′
x
′
km.
And speed of boat in still water be
′
S
′
km/hr.
According to question,
In downstream,
x=(S+2)x4 ........(1) as, (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.
Answered by
0
Step-by-step explanation:
A motor boat goes downstream covers distance=4 hour.
Cover the same distance upsteam =5 hour.
the speed of the steam is 3km
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