A boat covers 12km upstream and 18km downstream in 3hrs while it covers 36km up stream and 24km down...........

Quantitative Aptitude ( CCS) Boats and Streams

A boat covers 12km upstream and 18km downstream in 3hrs. while it covers 36km up stream and 24km downstream in 6(1/2) hrs. find velocity of the stream?

1.5kmph

1kmph

2kmph

2.5kmph

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Explanation:

Solution:
12/y + 18/x =3…………..(1)
36/y + 24/x = 13/2……………(2)
By solving above equation we will get
X=12kmph, y = 8kmph
Speed of stream = (12-8)/2 = 2kmph