Postal or Sorting Assistants Model Paper 3 With Solutions

Question : 20 of 100

Marks: +1, -0

A train 100 metres long moving at a speed of 50 km/h crosses a train 120 metres long coming from opposite direction in 6 seconds. The speed of the second train is

132 km/h
82 km/h
60 km/h
50 km/h

Validate

Solution:

Let the speed of the second train be x km/hr. Relative speed = (x + 50) km/hr

=[(x+50)x 5/18]m/sec =[{250 + 5x}/18]

m/sec
Distance covered = 100 + 120 = 220 m

220/{250+5x}/18=6

⇒

250 + 5x ={220 + 18}/6

⇒250 + 5x = 660
⇒x = 82 km/hr

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