6.
Deepak a train driver, while crossing a tunnel spotted himself at the midpoint of the tunnel whose
length is 4 times the length of the Deepak's train. From this point train takes 60 sec to completely
emerge out from the tunnel. How much time will the Deepak's train take to completely cross another
tunnel whose length is thrice the length of the previous tunnel?
a) 220 sec
b) 240 sec
c) 260 sec
d) none of these
Answers
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Step-by-step explanation:
let length of Deepak's train = x
length of tunnel= 4x
counting started at half the length of tunnel= 2x
2x=60sec (1)
length of another tunnel = 3×previous tunnel.
= 3×4x = 12x (2)
on equating (1) and (2)
2x×?= 60sec×12x
?= 30sec×12 = 360 sec
the answer is none of these.
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