Aptitude Day 289

Problems on Trains: 

1. The length of the bridge, which a train 180 m long and travelling at 108 km/hr can cross in 20 seconds, is:

Solution:

                  Speed = 108*5/18 

                             = 30 m/s.

                  30 = (180+x)/20

                  x = 600-180 

                     = 420 m.

2. A train passes a platform in 24 seconds and a man standing on the platform in 10 seconds. If the speed of the train is 36 km/hr, what’s the length of the platform?

Solution:

                  Length of the train = 10*(36*5/18)

                                                 = 100 m.

                  (100+x)/24 = 36

                   x = 864- 100

                      = 764 m.