Problems with Trains for Postal Assistant Exam

1. A 400m long train is running at 72 Kmph. how much time it will take to cross an electric pole?

A.) 15sec B.) 20sec  C.) 19sec D.) 21sec

Answer: Option 'B'
Formula: Distance = Speed * Time
If we convert Kmph in to Mpsec multiply by 5/18,
400 = 72 KmpH * time
400 = 72*5/18 * time
Time = 20Sec

2. A 180m long train is running at 54 Kmph. how much time it will take to cross a platform of 120m long?
A.) 20sec B.) 22sec  C.) 19sec D.) 18sec

Answer: Option 'A'
Formula: D = S * T
180 = 54 Kmph * Time
180= 54*5/18 * Time
Time = 20 Sec 

3. 320m long train is running at 72 Kmph. how much time it will take to cross a platform of 180m long?

A.) 20sec B.) 25sec  C.) 30sec D.) 27sec

Answer: Option 'B'
Total Length = platform Length+ Train Length
Total Length= 500m
D = S * T
500 = 72 * time
500 = 72 * 5/18 * time
Time = 25Sec 

4.A 600m long train is running at 90 Kmph. how much time it will take to cross an electric pole?

A.) 16sec B.) 20sec C.) 24sec D.) 22sec

Answer: Option 'C'
Formula: D = S * T
600 = 90 Kmph * T
600 = 90 * 5/18 * T
Time = 24Sec 

5. Two trains 300m and 400m long run at the speeds of 40 kmph and 50kmph respectively in opposite
Directions on parallel tracks. The time taken to cross each other?

A.) 20sec B.) 25secs C.) 26sec D.) 28sec

Answer: Option 'D'
Length of two Trains = 300m + 400m = 700m
Total Speed= 40 Kmph + 50 Kmph (Opposite Direction)
= 90 Kmph
Time = Distance/Speed
Time = 700/ 90
Time = 28Sec