A goods train 350 m long passes through a tunnel of length 1250 m in 80 seconds. What is the speed of the train?

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**Solution:**

1. Calculate the total distance traveled by the train:
   - Length of train = 350 m
   - Length of tunnel = 1250 m
   - Total distance = 350 + 1250 = 1600 m

2. Calculate the speed of the train in meters per second (m/s):
   $$	ext{Speed} = \frac{	ext{Distance}}{	ext{Time}} = \frac{1600}{80} = 20 	ext{ m/s}$$

3. Convert the speed from m/s to km/h:
   $$20 	imes \frac{18}{5} = 20 	imes 3.6 = 72 	ext{ km/h}$$

**Answer:** The speed of the train is **72 km/h**.

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