# 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 â€“

 [ 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