Answer :
Final answer:
The train will take 12 seconds to cross the 175 meter long bridge.
Explanation:
To determine the time it will take for the train to cross the bridge, we need to first find the total distance the train needs to travel.
The total distance is the sum of the length of the train and the length of the bridge, which is 125m + 175m = 300m.
Next, we will convert the train's speed from km/h to m/s.
There are 1000m in 1km and 3600s in 1 hour, so the train's speed is 90 km/h * (1000m/1km) * (1h/3600s) = 25 m/s.
Finally, we can calculate the time it will take for the train to cross the bridge using the formula time = distance/speed.
So, the time it will take for the train to cross the bridge is 300m / 25m/s = 12 seconds.
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