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Aptitude Day 288

Answers of Day 287: 1. 7(1/7) seconds.
                                    2. 14 seconds.

Problems on Trains: 

1. A train covers a distance of 6 km in 5 minutes. If it takes 3 seconds to pass a telegraph post, then the length of the train is:

Solution:
                 Speed = 6/5 * 60 
                            = 72 km/hr 
                            = 72*5/18 
                            = 20 m/s..

                 Length = 20*3 
                             = 60 m.

2. A train 120 m long passed a pole in 12 seconds. How long will it take to pass a platform 500 m long?

Solution:
                  Speed = 120/12
                             = 10 m/s.

                   Time = (120+500)/ 10 
                             = 620/10 
                             = 62 seconds.


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