A person standing on a railway platform noticed that a train took 21 seconds to completely pass through the platform which was 84 m long and it took 9 seconds in passing him. The speed of the train was

A person standing on a railway platform noticed that a train took 21 s

1.	A person standing on a railway platform noticed that a train took 21 seconds to completely pass through the platform which was 84 m long and it took 9 seconds in passing him. The speed of the train was
A.	25.2 km/hour
B.	32.4 km/hour
C.	50.4 km/hour
D.	75.6 km/hour
Answer» B. 32.4 km/hour

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A person standing on a railway platform noticed that a train took 21 seconds to completely pass through the platform which was 84 m long and it took 9 seconds in passing him. The speed of the train was

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