-train 1000m long (1km)
-travels through 3000m (3km)
-train was inside the tunnel for 30 seconds
-1000 m= 1km
-1 minute= 60 seconds
-60 mins= 1 hour
This means that the train has to travel 2000 metres or 2 kilometres in 30 seconds. There are 60 seconds in one minute, so...
2 km/30 seconds= 4 km/1 minute
We need to find km per hour. There are 60 minutes in one hour.
4 km/1 minute= 240 km/ 1 hour
This means that that train travelled through the tunnel at a speed of 240 km/ hour.
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