Two trains 120m & 80m in length are running in opposite directions with velocities 42km/h & 30km/h. In what time they will completely cross each other?
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length = 120+80= 200 m
velocity = u=42km/hr = 42×5/18=35/3m/sec
v=30km/hr= 30×5/18 =25/3m/sec
time taken to cross each other = (a+b)/u+v)
=(200)/35/3+25/3)
=200/20=10sec
velocity = u=42km/hr = 42×5/18=35/3m/sec
v=30km/hr= 30×5/18 =25/3m/sec
time taken to cross each other = (a+b)/u+v)
=(200)/35/3+25/3)
=200/20=10sec
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