# 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.