Question

A train 210m long, crosses a bridge 90m long in 12 seconds.what is the speed of train.

Answer 1

total distance = distance of bridge + length of train = 90+210 = 300 m

total time = 12 sec

speed = distance / time = 300/12 = 25 m/sec

Answer 2

Hey,
DATA,
distance=210+90=300m
time=12sec.
speed =distance/time
300/12=25m/s....
plz mark as brainaist.........