Question

a 100m long train moving with constant speed of 90km/h crosses a tunnel of 300m long.the time taken by the train to
cross the tunnel completely is

Answer 1

Hey mate!!!

First convert speed to m/s because the distance is in metre
so 90km/h = 90× 5/18 = 25m/s
Now total distance
= Length of train + Distance of tunnel
= 100 + 300
= 400m

We know that time = Distance/speed
so
time =
$\frac{400}{25} = 16$
So time taken is 16 second

Hope it helps dear friend ☺️✌️✌️

Answer 2

Answer:

16 s

Explanation:

Speed of train =90 km/h and length of train =100m =0.1km

length of tunnel =300m=0.3km

Time taken to cross the tunnel completely =  

90km/h

0.3km+0.1km

​  

 

=  

90km/h

0.4km

​  

=  

900

40

​  

hour =0.044 hour