a train is moving on a straight track n travels at a speed of72km/hr and passes a pole in 3 seconds. find the time taken by the train to pass the bridge of length of 540 m?
72 km/h = 20 m/s
Use SI units for the calculation.
total time to cross =
(time for engine to cross) + (time for all of train to pass a given point)
= L/V + 3 seconds
L = 540 m
I answered this several days ago. Why are you still posting it?
52.5
To solve this problem, we can use the concept of relative velocity.
First, let's find the length of the train by converting the speed of the train from km/h to m/s.
72 km/h = (72 * 1000 m) / (60 * 60 s) = 20 m/s
Since the train passes the pole in 3 seconds, the length of the train can be calculated as:
Length of train = Speed * Time = 20 m/s * 3 s = 60 m
Now, let's consider the train passing the bridge. The train passes a total distance, which is the sum of the length of the train and the length of the bridge.
Total distance = Length of train + Length of bridge
Total distance = 60 m + 540 m = 600 m
We need to find the time taken by the train to pass the bridge. Time is equal to distance divided by speed.
Time = Total distance / Speed = 600 m / 20 m/s = 30 s
Therefore, the train will take 30 seconds to pass the bridge.