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A train consists of 12 bogies, each boggy 15 m long. The train crosses the telegraph post in 18 seconds. Due to some problems, two bogies were detached. The train now crosses the telegraph post in

Answer:

Explanation:

Speed of train = $\frac{length\quad of\quad train }{time}$

$=\frac{15\times 12 }{18}$

= 10 m/sec

When 2 bogies are detached, length of train $=180-30$ $=150$ m

Time taken to cross the telegraph post $=\frac{150}{10}$ = 15 sec