Discussion :: Problems on Trains
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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:
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Answer : Option C
Explanation :
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.
 | (100 + 100) | = 3x |
| 8 |
24x = 200
| x = | 25 | . |
| 3 |
| So, speed of the faster train = | 50 | m/sec |
| 3 |
| = |  | 50 | x | 18 |  km/hr |
| 3 | 5 |
= 60 km/hr.
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