A train 700 m long is running at 72 kmph. If it crosses a tunnel in 1 minute, the length of the tunnel is:
A. 700
B. 600
C. 550
D. 500
Solution(By Examveda Team)
Length of train = 700 m
Length of tunnel = X (let)
Time taken to cross the tunnel = 1 minute = 60 sec.
Speed = 72 kmph = (72*5)/18 = 20 m sec.
To cross the tunnel train needs to travel = Length of train + length of tunnel = 700 +X
Now,
S*T = D
20 *60 = 700 +X
X = 1200 - 700 = 500
Length of tunnel = 500 m.
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Speed = 72 kmph = (72*5)/18 = 20 m sec. ?
how did u solve this ?
D)500
600
500