Q1 . Two trains A and B are of length 500 m and 400 m respectively.The train A has a speed of 50 m/s and B has a speed of 40 m/s .How long will it take for A to overtake B?
1. 90 seconds
2. 95 seconds
3. 80 seconds
4. 20 seconds
Correct Answer is
90 seconds
SOLUTION
total distance to be covered is length of the trains=500+400
effective speed in same direction is 50 -40=10 m/s
time taken =900/10=90 seconds
Q2 . The time taken by a train to cross a lamp post is 10 seconds.The speed of the train is 50 m/s.Find the length of the train?
1. 520 meters
2. 300 meters
3. 500 meters
4. 200 meters
Correct Answer is
500 meters
SOLUTION
distance of train=time x speed=10x50
500 meters
Q3 . The length of two trains in opposite directions 500 and 600 meters.The time taken by the train to cross one another is 50 s.speed of one train is 15 m/s find the speed of the other?
1. 15m/s
2. 27 m/s
3. 7 m/s
4. 17 m/s
Correct Answer is
7 m/s
SOLUTION
total distance =1100 m
time taken in opposite direction=1100/S1+S2
50(S1+S2)=1100
putting one speed as 15
speed of other train is 7 m/s
Q4 . What is the time taken by a trains to cross a bridge coming from opposite directions.If the length of the trains and bridge is 500 m ,400 m and 1 KM respectively and the speeds of the trains are 30 m/s and 20 m/s?
1. 38.5 seconds
2. 37 seconds
3. 38 seconds
4. 39 seconds
Correct Answer is
38 seconds
SOLUTION
let us convert distance to meters
tota distance to be covered=distance of the bridge+length of trains
1000+500+400=1900 m
time taken=1900/(30+20)
38 seconds
Q5 . The time taken by a train to cross a man running in the opposite direction is 10 secpnds with the length of the train and speed being 650 m and 50 m/s respectively.Find the speed of the running man?