Subject
Quantitative Aptitude
Topic
Speed & Distance
Two trains, each 100 m long, moving in opposite directions, cross each other in 8 seconds. If one is moving twice as fast the other, then the speed of the faster train is:
Two trains, each 100 m long, moving in opposite directions, cross each other in 8 seconds. If one is moving twice as fast the other, then the speed of the faster train is:
ক)
30 km/hrখ)
45 km/hrগ)
60 km/hrঘ)
75 km/hrExplanation
Let the speed of the slower train be x m/sec. Then, speed of the faster train = 2x m/sec. Relative speed = (x + 2x) m/sec = 3x m/sec. So, (100 + 100)/8 = 3x => 24x = 200 => x = 25. So, speed of the faster train = (50/3) m/sec = (50/3) x (18/5) km/hr = 60 km/hr.Related questions
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