Question

A train 210m long is running at a speed of 90 km/hr.It crosses a tunnel in 12 seconds. Find the length of the tunnel.​

Answer 1

Answer:

90m

Step-by-step explanation:

Length length of the train = 210m

Speed of the train = 90km/hr = 90×(5/18) m/s

= 25m/s

Time taken=12s

Length of the tunnel = x m

Speed = Total distance/total time

25= (210 + x)/12

==> 25 × 12 = 210 + X

==> 300 = 210+X

==> X= 300-210 = 90m