A 500 m long train running at a speed of 100 m/s crosses a tunnel in 10 s. What is the length of the tunnel?

A200 m

B500 m ✓ Correct

C800 m

D1000 m

Correct answer: (B) 500 m

Explanation

The tunnel is 500 m long.

Distance covered in 10 s = 100 x 10 = 1000 m.

This distance = train length + tunnel length.

1000 = 500 + tunnel length.

Tunnel length = 1000 - 500 = 500 m.

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