A train 100 m long is to cross a river bridge of length 800m. What time will it take to cross the bridge? Given the train moves with a constant speed of 36m/s.
time = distance/speed
time for the engine to get across: 800m ÷ 36m/s = _____ s
add to that the time for the rest of the train to cross: 100m ÷ 36 m/s = ____ s
gtd43a
To find the time it takes for the train to cross the bridge, we need to consider the total distance it has to travel -- which is the length of the train plus the length of the bridge.
First, we calculate the total distance the train needs to cover:
Total distance = length of train + length of bridge
Total distance = 100 m + 800 m
Total distance = 900 m
Next, we need to calculate the time it takes for the train to travel this distance with a constant speed of 36 m/s.
Time = Distance / Speed
Time = 900 m / 36 m/s
Time = 25 seconds
Therefore, it will take 25 seconds for the train to cross the bridge.