Question

a 180 m long train crosses another 270 m long train running in the opposite direction in 10.8 s. if the speed of the first tain is 60 km/h, what is the speed of the second train in km/h?

Answer 1

sum of the distance covered =450m

time=10.8
relative speed in op direction=60+s.

(60+s)*1000/3600=450/10.8

(60+s)*1000*10.8=450*3600

60+s=450*3600/10800
60+s=150
s=90

Answer 2

Answer:

therefore answer is 90kmph