Question

A 100 meter long train running at 72 kmoh crosses a bridge in 25 sec .What is the length of bridge

Answer 1

Speed = distance/ time

speed is equal to 72 km per hour

time is equal to 25 second = 25/3600 hour

length of the train is equal to 100 m= 0.1km

firstly we can find the distance travelled ;

72= s/25

72x(25)/3600 =s

0.5km=s

distance of the bridge is equal to total distance - length of the train

0.5km-01km = 0.4km

so therefore the length of the bridge is equal to 0.4 km or 400 m....