Direction Solve the questions for trains,speed and Acceleration.
1.

Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is:
A. 1:3 B. 3:2
C. 3:4 D. none of these
Answer and Explanation
Answer:Option
Explanation: Let the speeds of the two trains be x m/sec and y m/sec respectively. Then, length of the first train = 27x metres, and length of the second train = 17y metres. 27x + 17y = 23 x+ y 27x + 17y = 23x + 23y 4x = 6y x = 3 . y 2
2.

A train 240 m long passes a pole in 24 seconds. How long will it take to pass a platform 650 m long?
A. 65 sec B. 89
C. 100 D. 150
Answer and Explanation
Answer:Option B
Explanation: Speed = 240 m/sec = 10 m/sec. 24 Required time = 240 + 650 sec = 89 sec. 10