Subject
Quantitative Aptitude
Topic
Speed & Distance
Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:
Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:
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9খ)
9.6গ)
10ঘ)
10.8Explanation
Relative speed = (60 + 40) km/hr = (100 x (5/18)) m/sec = (250/9) m/sec. Distance covered in crossing each other = (140 + 160) m = 300 m. Required time = (300 x (9/250) sec. =(54/5) sec = 10.8 sec.Related questions
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