1.

a 100m long train, remaining at a speed of 48 km/hr passes a tunnel in 21 sec. let's calculate the length of the tunnel.

Answer»

ANSWER:

Step-by-step explanation:

   T + B = 48× 5/18× 21

   100 + B = 40/3× 21

   100 + B = 280

   B = 280 - 100

   So it's LENGTH is

   B = 180.



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