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Two trains A and B of length 60 m and 40 m running in opposite directions with the same speed and they cross each other in 10 seconds. Then, find the speed of each train.1. 4 km/h2. 12 km/h3. 18 km/h4. 5 km/h |
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Answer» Correct Answer - Option 3 : 18 km/h Given: Length of train A = 60 m Length of train B = 40 m Time taken to cross each other = 10 seconds Formula used: Speed = Distance/Time Calculation: Let the speed of both trains be x m/s Relative speed = (x + x)km/h = 2x m/s Now, Time = (60 + 40)/(2x) ⇒ 10 = 100/2x ⇒ 2x = 10 ⇒ x = 5 m/s ⇒ x = 18 km/h [1 m/s = 18/5 km/h] |
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