How long does a train 110 meters long running at the speed of 72 km hour take to cross a

b)12.1s
132+110/20
10 years agoHelpfull: Yes(6) No(0)
total lengt the train must travelled is 110+132=242
speed is 72*(5/18)=20m/sec
time=(242/20)=12.1sec
10 years agoHelpfull: Yes(6) No(0)
St*T=(Lt+Lb)
72*(5/18)T=110+132
20T=242
T=12,1seconds -----answer
Lt=length of train
Lb=length of bridge
St=speed of train
T=time
9 years agoHelpfull: Yes(1) No(0)
dis=110+132=242
time=242/20=8.1sec
10 years agoHelpfull: Yes(0) No(3)
72 km/hr in m/s = 72*5/18 = 20 m/s
now total distance = 110+132 m = 242 m

so,time = 242/20 = 12.1 seconds
9 years agoHelpfull: Yes(0) No(0)
Length of train is 110 m
Length of Bridge is 132 m
So, to pass train from the Bridge total distance travel is 242 m

Speed of train is 72 km/hr.
Therefore, in 1 sec train will travel 72*(5/18) = 20 m
Now, to pass 242 m time required is 242/20 = 12.1 sec
Option b is correct.
9 years agoHelpfull: Yes(0) No(2)
TRAIN CROSSING A STATIONARY OBJECT WITH THE LENGTH
THEN THE FORMULA: (speed of the train)*time=(length of the train+length of the object)
here speed of the train: 72km/h=72000m/h length of the train: 110 meter
length of the bridge: 132 meter
so, 72000*t=110+132
=> t=242/72000 => t= 0.00336 h= 0.00336*3600 sec =12.1 sec (b)
9 years agoHelpfull: Yes(0) No(0)
ans should be (b)
9 years agoHelpfull: Yes(0) No(0)
speed 72km/hr
convert it into m/sec=72*(5/18)=20 m/sec.
Total distance covered=110+132=242 meter.

time=distance/speed.
time=242/20
time=12.1seconds.
9 years agoHelpfull: Yes(0) No(0)
12.1 seconds
9 years agoHelpfull: Yes(0) No(0)

How long does a train 110
meters long running at the speed of 72 km/hour take to cross a
bridge 132 meters in length ?
a)15 seconds
b)12.1 seconds
c)10 seconds
d)8.1 second