Question

9.
A train 210 m long took 12 seconds to pass a 90 m long tunnel. Find the speed of
the train.​

Answer 1

hl omate here is ur ans....

Length of train = 210 m.

Length of tunnel = 90 m.

Therefore, total distance = 210 + 90 = 300 m.

ime taken = 12 s.

Therefore, v = s/t

                   = 300/12.

                   = 25 m/s.

                   = 25 X 3600/1000

                   = 90 km/h.

Therefore, the speed of train is 90 km/h

hope this helps uh dear :)

pls mark as brainliest.....

Answer 2

Step-by-step explanation:

Total distance to be covered =

Length of train + Length of tunnel

Distance = 210 m + 90 m = 300 m

Time = 12 secs

$speed \: = \: \frac{distance}{time}$

$speed \: = \: \frac{300}{12} \: = \: \frac{150}{6} \: = \: \frac{50}{2} \: = \: 25\: meters \: per \: second$

Hope this helps

Please mark as brainliest