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RRB Junior Engineer Stage 1 Model Papers 7
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© examsnet.com
Question : 7
Total: 100
A train 150 m long passes a km stone in 30 seconds and another train of the same length travelling in opposite direction in 10 seconds. The speed of the second train is :
125 km/hr
25 km/hr
90 km/h
75 km/hr
Validate
Solution:
Speed of first train
150
30
=
5
m/sec
Let the speed of second train be x m/sec
Relative speed
=
(
5
+
x
)
m /sec
300
5
+
x
=
10
50
+
10
x
=
300
x
=
300
−
50
10
=
25
m
/
s
e
c
=
25
×
18
5
=
90
k
m
/
h
© examsnet.com
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