সব প্রশ্নে ফিরে যান
Math
A train of length 150 m takes 10 seconds to cross another train 100 m long coming from the opposite direction . If the speed of first train is 30 km / hr, what is the speed of second train?
A) 48km /hr
B) 54 km / hr
C) 60 km / hr
সঠিক উত্তর
D) 72 km / hr