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Delhi University MCA Previous Year Questions (PYQs)

Delhi University MCA Train PYQ



Two trains each 500 metres long, are running in opposite directions on parallel tracks. If their speeds are 50 km/hr and 40 km/hr respectively, the time taken by the slower train to pass the driver of the faster one is _______seconds





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Solution

Relative speed = (50 + 40) km/hr
=(90×518)m/sec
=25 m/sec.
We have to find the time taken by the slower train to pass the Driver of the faster train and not the complete train.
So, distance covered = Length of the slower train.
Therefore, Distance covered = 500 m.
∴ Required time (500×125​)=20sec.


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