1.

A train runs at a speed of 42 m/s and takes 35 seconds to pass a tunnel. after travelling some distance, it takes 15 seconds to pass a pole. what is the length of the tunnel?

Answer»

So,

While PASSING the tunnel it takes 35sec


Displacement = Velocity × Time


Therefore,

L(TRAIN) + L(Tunnel)

= 42 × 35 = 1470m


Now,

It takes 15 sec to pass a pole

So,

L(Train)

= 15×42= 630m


L(Tunnel) = 1470 - 630 = 840


So,

The LENGTH of tunnel is 840m



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