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### Question

A train of length 107m is running at a speed of 38m/s. How long will it take to cross a tunnel of length 45m?

**A**

4 sec.

**B**

5 sec.

**C**

3 sec.

**D**

6 sec.

**Soln.**

**Ans: a**

The total distance to be covered is equal to the length of the train plus the length of the tunnel. By the time and distance formula, we get time = distance/speed, which gives ${107 + 45}/38$ = 4s.