To travel 708 km, an Express train takes 6 hours more than Rajdhani train. If however, the speed of the Express train is doubled, it takes 3 hours less than Rajdhani train. What is the speed of Rajdhani train?
A) 59 km/hr B) 78.7 km/hr C) 39.3 km/hr D) 98.3 km/hr
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