A train takes one minute to cross a tunnel of length 250 meter at the speed of 36 km/hr. Find length of the train .
Answer & explanation
Correct answer: option 2
Length of train = 250 m
Length of tunnel = X (let)
Time taken to cross the tunnel = 1 minute = 60 sec.
Speed = 36 km/hr
= \(\frac{36\;×\;5}{18}\) m/sec = 10 m/sec
To cross the tunnel train needs to travel = Length of train + length of tunnel = 250 +X
Now,
distance = speed × Time
10 × 60 = 250 + X
X = 600 - 250 = 350 m
Length of tunnel = 350 m