TRAIN SOLVED PROBLEMS 1

1. 10 minutes

2. 20 minutes

3. 8 minutes

4. 6 minutes

8 minutes

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

1. 120 seconds

2. 140 seconds

3. 160 seconds

4. 150 seconds

150 seconds

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

1. 50 seconds

2. 52 seconds

3. 53 seconds

4. 54 seconds

50 seconds

total distance is 500+250=750 meters

speed =72 km/h or 72x5/18=15 m/s

time taken =750/15=50 seconds

1. 110 m

2. 100 m

3. 120 m

4. 102 m

100 m

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

1. 15 seconds

2. 14 seconds

3. 12 seconds

4. 16.67 seconds

16.67 seconds

distance travelled is length of train=500 m

effective speed for moving in opposite direction=10+20

time taken=500/30

time is 16.67 seconds

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