A train of length $150$ meters takes $40.5$ seconds to cross a tunnel of length $300$ metres. What is the speed of the train in $\text{ km } / \text{ hr }$ ?

The total distance the train covers is the sum of its length and the tunnel's length, which is 150 meters plus 300 meters to equal 450 meters. Using the formula speed equals distance divided by time, 450 meters divided by 40.5 seconds gives a speed of 11.111 meters per second. Multiplying this by 18/5 converts it to 40 kilometers per hour.

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