Question : A train travelling at 80 km/hr crosses another train travelling in the same direction at 26 km/hr in 30 seconds. What is the combined length of both the trains?
Option 1: 400 m
Option 2: 450 m
Option 3: 550 m
Option 4: 350 m
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Correct Answer: 450 m
Solution :
Relative speed of the trains = 80 – 26 = 54 km/hr = $54×\frac{5}{18}$ =15 m/s
Time taken = 30 s
Distance = 15 × 30 = 450 m
So the combined length of both trains = 450 m
Hence, the correct answer is 450 m.
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