Question

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

Answer 1

Length of train = 210 m.

Length of tunnel = 90 m.

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

Time 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

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Answer 2

$\Large{\textsf{\pink{\underline{ANSWER}}}}$

GIVEN :

Length of train = 210 m.

Length of tunnel = 90 m.

TO FIND :

Speed of the Train.

SOLUTION :

Total distance = 210 + 90 = 300 m.

Time taken = 12 s.

Therefore, $\sf v = \dfrac {s}{t}$

= $\sf \dfrac{300}{12}$

= $\sf25 m/s$

= $\sf 25 \times \dfrac{3600}{1000}$

= $\sf 90 km/h$

Therefore, the speed of train is 90 km/h