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CAT 2020 Exam Shift 2 Solved Paper
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© examsnet.com
Question : 69
Total: 76
The distance from
B
to
C
is thrice that from
A
to
B
. Two trains travel from
A
to
C
via
B
. The speed of train 2 is double that of train 1 while traveling from
A
to
B
and their speeds are interchanged while traveling from B to
C
. The ratio of the time taken by train 1 to that taken by train 2 in travelling from
A
to
C
is
1
:
4
7
:
5
5
:
7
4
:
1
Validate
Solution:
Given,
Let the speed of train 1 from
A
to
B
be s.
Then the speed of train 2 from
A
to
B
is
2
s
.
Time taken by train 1 to cover
A
to
C
=
D
s
+
3
D
2
s
=
5
D
2
s
And, time taken by train 2 to cover
A
to
C
=
D
2
s
+
3
D
s
=
7
D
2
s
Required ratio
=
5
D
2
s
:
7
D
2
s
⇒
5
:
7
© examsnet.com
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