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Electrical Engineering

Two mail trains Pand Q of 300 m and 600m, run at speed of 130 km/hr and 160 km/hr respectively, in the direction opposite direction to each other. Find the time required to cross each other after the moment they met? A) 11.17 sec B) 12sec C) 9.10sec D) 21sec

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Two mail trains Pand Q of 300 m and 600m, run at speed of 130 km/hr and 160 km/hr respectively, in the direction opposite direction to each other. Find the time required to cross each other after the moment they met? A) 11.17 sec B) 12sec C) 9.10sec D) 21sec
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 ANSWER:A

Explanation:

 Length of train P = 300 m

 Length of train Q = 600 m

 Speed of train p = 130 kmph

 Convert km/hr into m/s,

 Speed of train p =(130 *5/18)m/s

 = 650/18 m/s

 = 36.11 m/s

 Speed of train Q = 160 kmph

 Convert km/hr into m/s,

 Speed of train Q = (160*5/18)m/s

 = 800 / 18 m/s

= 44.44 m/s

 As both trains move opposite to each other,

 relative speed = 36.11+44.44 = 80.55 m/s

 Distance = (Length of train A + Length of train B)

 = (300+600)m

= 900 m

We know, time =distance /speed

 = 900/ 80.55

 = 11.17seconds
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