The speeds of two trains are in the ratio 6 : 7. If the second train runs 364 km in 4 hours, then the speed of first train is –



[ A ]    60 km/hr
[ B ]    72 km/hr
[ C ]    78 km/hr right
[ 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 ×$7\over6$= 78 km/hr

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