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KVPY SA Exam 2015 Question Paper
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© examsnet.com
Question : 11
Total: 80
A man standing on a railway platform noticed that a train took 21 seconds to cross the platform (this means the time elapsed from the moment the engine- enters the platform till the last compartment leaves the platform) which is 88 metres long, and that it took 9 seconds to pass him. Assuming that the train was moving with uniform speed, what is the length o f the train in metres?
55
60
66
72
Validate
Solution:
Let speed of train is v m/s.
So
v
×
21
=
88
+
l
⇒
21
v
=
88
+
l
& also
⇒
v
×
9
=
l
So
21
×
l
9
=
88
+
l
⇒
l
=
66.
© examsnet.com
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