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What is the correct answer?
4
A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is
A.
45 km/hr
B.
50 km/hr
C.
54 km/hr
D.
55 km/hr
Correct Answer :
B. 50 km/hr
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=
125
10
m
/
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=
25
2
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/
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.
=
25
2
x
18
5
k
m
/
h
r
=
45
k
m
/
h
r
.
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p
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d
=
(
x
-
5
)
k
m
/
h
r
.
∴
x
-
5
=
45
⇒
x
=
50
k
m
/
h
r
.
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