The Speed of the Second Train in (km/hr) :
A rain 108 m long moving at a speed of 50 km/hr crosses a train 112 mt long coming from opposite directions in 6 seconds. The speed of the second train in (km/hr):
- 82
- 66
- 54
- 48
Answer: (1) 82
Explanation:-
Let the speed of the second train be X km/hr
Then, the relative speed = (X + 50) km/hr
Speed in m/sec = (X + 50) x 5/18
= 5 X/18 + 50 x 5/18
= (X + 50) x 5/18 m/sec
Then, the distance covered by the trains = (108 + 112) mt.
Therefore, 220/(250 + 5 X)/18 = 6
250 + 5 X = 660
5 X = 660 – 250
5 X = 410
X =410/5
X = 82 km/hr
Then, the speed of second train is 82 km/hr.
Hence, the answer is (1) 82 km/hr.