Q1 . A train is travelling at a speed of 10 km/h.There is a train approaching this train in the opposite direction at 10 km/h .The length of each train is 1 km.The time taken by the trains to cross each other?
1. 10 minutes
2. 20 minutes
3. 8 minutes
4. 6 minutes
Correct Answer is
8 minutes
SOLUTION
total distance is the length of trains=1+1=2km
The effective speed for trains in opposite direction is 10+10=20 km/h
so time taken =2/20=1/10 hours or 6 minutes
Q2 . There is a train of length 500m travelling at a speed of 36 km/h.Find the time taken to cross the lamp post at a distance of 1 km from the current postition?
1. 120 seconds
2. 140 seconds
3. 160 seconds
4. 150 seconds
Correct Answer is
150 seconds
SOLUTION
let us convert distance to meters
tota distance to be covered=distance of lamp post and length of train=1000+500=1500 meters
speed=36x5/18=10m/s
time taken=1500/10=150 seconds
Q3 . A train of length 500 m to cross a platform of 250m.speed of the train is 72 km/h.Find the time taken to cross the platform?
1. 50 seconds
2. 52 seconds
3. 53 seconds
4. 54 seconds
Correct Answer is
50 seconds
SOLUTION
total distance is 500+250=750 meters
speed =72 km/h or 72x5/18=15 m/s
time taken =750/15=50 seconds
Q4 . A train of length 500m to cross a lampost at a certain distance.It takes 20 s for the train to cross the distance 30 m/s .Find the distance in Km
1. 110 m
2. 100 m
3. 120 m
4. 102 m
Correct Answer is
100 m
SOLUTION
total distance =length of train+distance to lampost
500+x
time taken=500+x/20
30=500+x/20
600=500+x
x=100 m
Q5 . A train of length 500m and going at a speed of 20 m/s crosses a man walking in the opposite direction at a speed of 10 m/s.Find the time taken by the train to cross the man walking towards it?
1. 15 seconds
2. 14 seconds
3. 12 seconds
4. 16.67 seconds
Correct Answer is
16.67 seconds
SOLUTION
distance travelled is length of train=500 m
effective speed for moving in opposite direction=10+20