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What is the correct answer?
4
A 300 meter long train crosses a platform in 39 seconds while it crosses a signal pole in 18 seconds. What is the length of the platform.
A.
310 meter
B.
335 meter
C.
345 meter
D.
350 meter
Correct Answer :
D. 350 meter
Speed = Distance/time = 300/18 = 50/3 m/sec
Let the length of the platform be x meters
then
D
i
s
tan
c
e
=
S
p
e
e
d
×
T
i
m
e
x
+
300
=
50
3
×
39
⇒
3
(
x
+
300
)
=
1950
⇒
x
=
350
m
e
t
e
r
s
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