Question : A train running at 70 km/hr crosses another train running in the same direction at 34 km/hr in 25 seconds. What is the combined length of both trains (in metres)?
Option 1: 225
Option 2: 250
Option 3: 325
Option 4: 500
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Correct Answer: 250
Solution : Given: The speed of trains running in the same direction is 70 km/hr and 34 km/hr. Time is taken to cross each other = 25 seconds Relative speed of trains = 70 – 34 = 36 km/hr = 36 × $\frac{5}{18}$ m/s = 10 m/s We know, Distance = Speed × Time So, Distance = 10 × 25 = 250 metres $\therefore$ The combined length of both trains = 250 metres Hence, the correct answer is 250.
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