Question

2. Find the ratio of the times taken for a train 300 m
long and travelling at a speed of 63 km/h to cross a
person travelling at a speed of 9 km/h in the oppo-
site direction and to cross a bridge 400 m long. ​

Answer 1

Step-by-step explanation:

total distance travelled =700m; At the speed of 63km/h;V1=63×1000/3600=17.5ms V1=x/t1 ; t1=700/17.5 =40 sec At speed of 9km/h; V2=9×1000/3600=2.5m/s V2=x/t2 ; t2=700/2.5=280 sec ;t1/t2=40/280=1/7=0.143 sec or t2=7×t1