Question

A train 700 m long is running at the speed
of 72 km/h. If it crosses a tunnel in 1 min,
then the length of the tunnel is
(a) 650 m (b) 500 m (c) 550 m (d) 700 m​

Answer 1

Correct Answer:-

500 mts.

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$\downarrow\large{Let\;the\;length\;of\;the\;tunnel\;be\;= x\:mts}$

$\downarrow\large{Speed\;of\;the\;train=72kmph=72\times\frac{5}{18}=20m/sec}$

Therefore,

$\implies\large{\frac{(700+ x)}{20}=60}$

$\downarrow\large{(i.e)Time\:taken\:to\:cover(700+x)}$

$\implies\large{(700+x)=60\times{20}}$

$\implies\large{700+x=1200}$

$\implies\large{x=1200-700}$

$\implies\large{500mts}$ AnsweR

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