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`        A 100m long train crosses a man travelling at 5km per hour in opposite direction in 7.2 seconds then velocity of train is?`
one year ago

Arun
24739 Points
```							Let the speed of the train  = xSince the man and the train are moving in opposite direction'The relative speed = (5 + x) km/hTime taken to overtake the man is the time required to cover a distance of 100m (the length of the train)100 m = 0.1km and 7.2 seconds = 7.2/3600 = 0.002 hours  Time = Distance/SpeedTime = 0.1/(x + 5) = 0.002 x +5 = 0.1/0.002 = 50 x = 50 -5x = 45 The speed of the train =  45km/hRegardsArun (AskIITans forum expert)
```
one year ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions