A train consists of 12 bogies, each bogie is 15 metres long. The train crosses a telegraph post in 18 seconds. Due to some problem, two bogies were detached. The train now crosses a telegraph post in

Train has 12 bogies.

Each bogie is 15 metre long.

∴ Total length of bogie

= 15 × 12 = 180 metre

Since, train crosses in 18 second

∴

=

Due to some problem, 2 bogies were detached

∴ Remaining bogies = 12 –2 = 10

∴ Total length of bogie = 15 × 10 = 150

Thus,