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### Discussion :: Problems on Trains

1. A train moves past a telegraph post and a bridge 264 m long in 8 seconds and 20 seconds respectively. What is the speed of the train?

2.  A. 69.5 km/hr B. 70 km/hr C. 79 km/hr D. 79.2 km/hr

Explanation :

Let the length of the train be x metres and its speed by y m/sec.

 Then, $$\frac { x} { y }$$ =8       x = 8y

now,$$\frac{x+264}{20}=y$$

8y + 264 = 20y

speed= 22 m/sec=$$(22\times\frac { 18 } { 5 } ) km/hr = 79.2 km/hr$$

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