Aptitude Reasoning English GK Computer Knowledge Programming Skill Banking Software Testing

Question

Find the length of the bridge which a train 210 meters long and traveling at 70 km/hr can cross in 15 seconds is?

  • 80
  • 70
  • 60
  • 50
Answer- A

Speed = 70 x 5/18 m/sec = 175/9 m/sec.

Time = 15 sec.

Let the length of the bridge be x meters.

Then, (210 + x)/15 = 175/9

(210 + x)*9 = 175*15

1890+9x=2625

9x=735

x = 81.6 m.