Subject: mathqa
Question: the two trains of lengths 400 m , 600 m respectively , running at same directions . the faster train can cross the slower train in 180 sec , the speed of the slower train is 48 km . then find the speed of the faster train ?
Option: 
A: 10 kmph
B: 56 kmph
C: 68 kmph
D: 76 kmph
Answer: C