To travel 648 km, an Express train takes 12 hours more than Rajdhani. If however, the speed of the Express train is doubled, it takes 6 hours less than Rajdhani. The speed of Rajdhani is _____.
A) 36 km/hr B) 18 km/hr C) 45 km/hr D) 27 km/hr
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Answer:
answer is option (a)
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