8. A train 210 m long took 12 seconds to pass a 90 m long tunnel. Find the speed of the train. Share with your friends Share 10 Varun.Rawat answered this Length of the train = 210 mLength of the tunnel = 90 mdistance covered in crossing the tunnel = length of train + length of tunnel = 210 + 90 = 300 mTime taken to cross the tunnel = 12 secspeed of train = distancetime taken = 30012 = 25 m/s 10 View Full Answer