A train of length 180m approaches a tunnel of length 620m. How long will it take the train to pass completely through the tunnel at a speed of 54km/h?
Answers
Step-by-step explanation:
As we know that time = distance / speed
Distance is 620m and speed is 54km/hr
First we make the unit same we will convert km in metres
1km = 1000m
54km = 54000m
So time = distance / speed
= 620m / 54000m per hr
Metre is cancel by metre
Time = 0.01148 hr.
Time in minutes is = 0.01148 X 60
= 0.6888 min
Time in seconds = 0. 6888 X 60
= 41.328 sec ANSWER
Step-by-step explanation:
speed of the train in metres/second = 54*100/60*60 =15m/s
length of the train = 180 m
Total distance = length of the train + length of the tunnel = (180 + 620) = 800m
Therefore,
time taken by the train to cross a distance of 15 m = 1 sec
time taken by the train to cross a distance of 1 m = 1/15 sec
time taken by the train to cross a distance of 620m = 1/15*620= 53.32 sec