When the entire train enters the tunnel there are 2000 metres left to travel (3000-1000=2000). The engine has to travel in 30 seconds. We could find the speed by dividing the distance travelled by the time it travelled.
The speed of the train is 2000/ 30 =2000/3 m/s.
All we have left is that we need to convert m/s to km/h
1. 2000m/3s x 1km/15s
2. 1km/15s x 60s/1min = 240 km/h
In the first one we are converting metres to kilometres,
In the second one we are converting seconds to minutes,
The answer is 240 km/h
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