A train 800 metres long is running at a speed of 78 km hr If it crosses a tunnel in 1 minute then th...........

Quantitative Aptitude ( CCS) Problems on trains

A train 800 metres long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is :

130

360

500

540

Speed =[ 78 x ( 5/18 ) ] m/sec = 65/3 m/sec.

Time = 1 minute = 60 sec.

Let the length of the tunnel be x metres.

Then, [ (800 + x )/ 60 ]= 65/3

$\Rightarrow$ 3(800 + x) = 3900

$\Rightarrow$ x = 500.

Hence, option 3 is the correct answer.

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