[ A ] 60 km/hr 

[ B ] 72 km/hr  
[ C ] 78 km/hr  
[ D ] 84 km/hr 
[ A ] 60 km/hr 

[ B ] 72 km/hr  
[ C ] 78 km/hr  
[ D ] 84 km/hr 
Answer : Option C 
Explanation : 
Distance covered by second train in 4
hours = 364 km Ths speed of second train = $364\over4$= 91 km/hr The ratio of speeds of train = 6 : 7 So, the speed of first train = 91 Ã—$7\over6$= 78 km/hr 
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