Question

A train 100m long is to cross a river of bridge of length 800m what time will it take to cross the bridge the train moves with a constant velocity of 36 km per hour

Answer 1

Hiii...
Here is your answer...

Solution:-
Length of train=100m
Length of bridge=800m
So,
Total Distance
=>800+100
=>900m

Speed=36km/h
$= > 36 \times \frac{5}{18} \\ = > 10$
=>10m/s

Now,
Distance travelled=speed×time
Similarly,
Time=Distance/speed
$= > \frac{900}{10} \\ = > 90$
Hence,
The total time taken:-
=>1min 30 seconds or 90 seconds.

Hope it helps uh...✌️✌️✌️

Answer 2

Total distance required for the train to cross the bridge is,

d = (100 + 800) m = 900 m

The speed of the train is,

v = 36 km/h = 36 × 5 / 18 = 10 m/s

Hence the time taken to cross the bridge is,

t = 900 / 10 = 90 s.