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A 450 m long train crosses the other one running in an opposite direction at the speed of 117 kmph in 13 sec. The length of other train is 200m. What was its speed?1). 67 km/hr2). 19 m/s3). 13 km/hr4). 17.5 m/s |
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Answer» Speed of 450 m long train = 117 kmph = 117 × (5/18) = 32.5 m/s TOTAL distance covered by trains while crossing each other = Sum of their lengths = 650 m Total TIME taken = 13 sec RELATIVE speed = $(\frac{{Total\;distance\;covered}}{{Total\;time\;taken}})$ = 650/13 = 50 m/s ∴ Speed of 200 m long train = Relative speed - Speed of longer train = 50 - 32.5 = 17.5 m/s |
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