जॉइन Examsbookउत्तर : 1. "400 m"
A train 900 m long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 min, then the length of the tunnel is ?5
प्र: A train 900 m long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 min, then the length of the tunnel is ?
- 1400 mtrue
- 2300 mfalse
- 3500 mfalse
- 4600 mfalse
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उत्तर : 1. "400 m"
व्याख्या :
Answer: A) 400 m Explanation: Speed = 78 x 5/18 = 65/3 m/sec.Time = 1 min = 60 sec.Let the length of the train be x meters.Then, (900 + x)/60 = 65/3x = 400 m.