ANSWER: B
Explanation:
Length of the 1st metro train = 360m
Length of the 2nd
metro train = 360m
Total length of the both metro train = 360 + 360 = 720 m
speed of the 1st metro train = 116 km/hr
speed of the 2nd
metro train = 100 km/hr
here two fast trains are running in same direction and their,
relative speed = (116 -100)km/hr
= 16km/hr
Convert km/hr into m/s
16km/hr = (16 * 5 / 18)m/s
= 40/9 m/s
Speed = distance / time
Required time = distance / speed
= (720/(40/9))sec
= 720 * 9 /40
= 162sec.