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NIMCET 2009 Question Paper with solutions
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© examsnet.com
Question : 60
Total: 120
A motorboat going downstream a river passes a raft (freely floating with the river current) at a certain point 'A'. Exactly one hour later it turned back and after some time while coming upstream it passed the same raft at a point
′
B
′
situated at a distance of
6
k
m
from point '
A
′
What is the speed of the water current in the river expressed in
k
m
∕
h
?
2.0
3.0
4.0
6.0
Validate
Solution:
Let
x
and
y
be speed of water current and motor boat respectively.
C
and
D
are respectively the points where raft and motor boar are located when motor boat turns back.
⇒
6
−
x
x
=
y
+
x
−
6
y
−
x
⇒
6
x
=
2
y
−
6
y
−
x
⇒
x
=
3
and
y
=
4
© examsnet.com
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