two trains 120 metre and 80 metre in length are running in opposite direction with velocity 40 kilometre per hour and 30 km per hour in what time they completely cross each other
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Answer:
2 hr 7/9 min
Explanation:
relative vel of train of vel 42 km/h w r t the other=42-(-30)=72 km/h as they are running opposite to each other.
the distance it (one withvel 42 km/h )have to cross=120+80=200 km to cross each other
will be=200/72 =2 hr 7/9 min
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