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Pls help me with this the correct answers are 2 kmph and 24m

Pls help me with this
 
the correct answers are 2 kmph and 24m

Question Image
Grade:11

2 Answers

ASANKA
36 Points
6 months ago
speed of train=v
length of coach=l
speed of boy relative to train is =(10-v)km/hr
in 1st case, the boy takes time to cover the train is=(30/1000)hr=0.003hr
then,(10-v)*0.003=l...........
thus for 2nd case, relative speed is=(10+v)km/hr
time taken=(20/10000)hr=0.002hr
then,(10+v)*0.002=l...........
solving 1 & 2
v=2 km/hr
l=24 m
hope it will be helpfull.
Vibekjyoti Sahoo
145 Points
14 days ago
speed of train=v
length of coach=l
speed of boy relative to train is =(10-v)km/hr
in 1st case, the boy takes time to cover the train is=(30/1000)hr=0.003hr
then,(10-v)*0.003=l...........
thus for 2nd case, relative speed is=(10+v)km/hr
time taken=(20/10000)hr=0.002hr
then,(10+v)*0.002=l...........
solving 1 & 2
v=2 km/hr
l=24 m

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