Question

A train runs past a telegraph pole in 15 s and through a tunnel of length 450 m in 45 s. The length of the
train is
a) 225 m
b) 325 m
c) 425 m
d) 450 m​

Answer 1

Ans (a)

the answer is 225 meter

Answer 2

Answer:

Length of the train is 225 m.

Solution:

Let the length of the train be x meters and its speed be y m/s.

Then, x / y = 15

y = x / 15

Now, (x + 450) / 45 = x / 15

(x + 450) = 3x

2x = 450

x = 225