A train travelling at 48 km/hr. crosses another train , having half its length and travelling in

Описание: 48 किमी/घंटा की गति से चलने वाली एक ट्रेन, अपनी आधी लंबाई वाली तथा विपरीत दिशा में 42 किमी/घंटा की गति से चलने वाली दूसरी ट्रेन को 12 सेकंड में पार करती है। यह एक रेलवे प्लेटफॉर्म को भी 45 सेकंड में पार करती है। रेलवे प्लेटफॉर्म की लंबाई कितनी है?
A train travelling at 48 km/hr. crosses another train , having half its length and travelling in opposite direction at 42 km/hr. , in 12 seconds. It also passes a railway plat form in 45 seconds. The length of the railway platform is:
200m
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400m
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