1 .	Two trains, each of length 125 metre, are running in parallel tracks in opposite directions. One train is running at a speed 65 km/hour and they cross each other in 6 seconds. The speed of the other train is –
[ A ]    75 km/hour [ B ]    85 km/hour [ C ]    95 km/hour [ D ]    105 km/hour
Answer : Option B Explanation : Distance to be covered = 125 × 2 = 250 m Time taken to cross each other = 6 sec Relative speed = ($250\over 6$) m/s = ($250\over 6$ x $18\over 5$) km/hr = 150 km/hr The speed of first train = 65 km/hr The speed of second train = (150 – 65) km/hr = 85 km/hr
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