![Train A crosses a man standing on a platform in 10.8 seconds. Train B crosses train A is running in the opposite direction](https://www.gkseries.com/blog/wp-content/uploads/2024/03/Train-A-crosses-a-man-standing-on-a-platform-in-10.8-seconds.-Train-B-crosses-train-A-is-running-in-the-opposite-direction.jpg)
Train A crosses a man standing on a platform in 10.8 seconds. Train B crosses train A is running in the opposite direction in 16 seconds. If the length of train A and B is 180 m and 220 m respectively, then what is the time taken by train B to cross a car is running in the same direction at the speed of 20 kmph?
A. 78.2 seconds
B. 76.2 seconds
C. 79.2 seconds
D. 80.2 seconds
E. None of these
Sol:
Speed of train A = 180/(10.8 * 5/18)
= 60 kmph
Speed of train B = x
180 + 220 = (60 + x) * 5/18 * 16
x = 90 – 60 = 30 kmph
Required time = 220/((30 – 20) * 5/18)
= 79.2 seconds