Train A, travelling at 'S' m/sec, can cross a platfo

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M: +1.00/-0.25

Train A, travelling at 'S' m/sec, can cross a platform double its length in 21 sec. The same train, travelling at (S + 5) m/sec, can cross the same platform in 18 sec. What is the value of 'S'?

[SBI Clerk 29 may2016]

A 27.5 m/s

B 32.5 m/s

C 30 m/s

D 35 m/s

E 25 m/s