Aptitude Day 293

Answers of Day 292: 1. 350 m. 

                                    2. 50 m.

Problems on Trains:

1. A jogger running at 10 km/hr alongside a railway track is 260 m ahead of the engine of a 130 m long train running at 49 km/hr in the same direction. In how much time will the train pass the jogger?

Solution:

                  Relative speed = 49-10 

                                           = 39 km/hr 

                                           = 195/18 m/s.

                   Time = (260+130)/ (195/18) 

                            = 390*18/195 

                            = 36 seconds.

2. A train 180 m long is running with a speed of 50 km/hr. In what time will it pass a man who is running at 5 km/hr in the direction opposite to that in which the train is going?

Solution:

                   Relative speed = 50+5 = 55 km/hr 

                                                        = 55*5/18 

                                                        = 275/18 m/s.

                   Time = 180*18/275

                            = 11.8 seconds.