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### Question

Two trains coming from opposite direction and running respectively at 24km/h and 48km/h cross each other in 11sec. What is the length of each train if the two trains are equal?

**A**

110 m.

**B**

111 m.

**C**

109 m.

**D**

112 m.

**Soln.**

**Ans: a**

The trains cover a distance equal to the sum of their lengths at a relative speed 24 + 48 = 72km/h × (5/18), or 20m/s. We can use the speed distance formula: sum of lengths = 20 × 11 = 220m. Halving this we get the length of one train = 110m.