Speed, Time and Distance
 A train 180 metres long is running at a speed of 90 km/h. How long will it take to pass a post ?

 8.2 secs
 7.8 secs
 8 secs
 7.2 secs

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Speed of train = 90 kmph
= 90 × 5 m/sec. 18
= 25 m/sec.
When a train crosses a post, it covers a distance equal to its own length.∴ Required time = Distance Speed = 180 = 7.2 seconds 25 Correct Option: D
Speed of train = 90 kmph
= 90 × 5 m/sec. 18
= 25 m/sec.
When a train crosses a post, it covers a distance equal to its own length.∴ Required time = Distance Speed = 180 = 7.2 seconds 25
 A train 300 m long is running with a speed of 54 km/hr. In what time will it cross a telephone pole?

 20 seconds
 15 seconds
 17 seconds
 18 seconds

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Speed of train = 54 kmph
= 54 × 5 m/sec = 15 m/sec 18 Required time = Length of trains Speed of train = 300 = 20 seconds 15 Correct Option: A
Speed of train = 54 kmph
= 54 × 5 m/sec = 15 m/sec 18 Required time = Length of trains Speed of train = 300 = 20 seconds 15
 A train, 120 m long, takes 6 seconds to pass a telegraph post; the speed of train is

 72 km/hr
 62 km/hr
 55 km/hr
 85 km/hr

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Speed of train = Length of train Time taken in crossing the pole = 120 = 20 m/sec 6 = 20 × 18 = 72 kmph 5 Correct Option: A
Speed of train = Length of train Time taken in crossing the pole = 120 = 20 m/sec 6 = 20 × 18 = 72 kmph 5
 A train 100 metres long meets a man going in opposite direction at 5 km/hr and
What is the speed of the train (in km/hr) ?passes him in 7 1 seconds. 5

 45 km/hr
 60 km/hr
 55 km/hr
 50 km/hr

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Let speed of train be x kmph
Relative speed = (x + 5) kmphLength of train = 100 km 1000 = 1 km 10 1 ∴ 10 x + 5 = 36 5 × 60 × 60 ⇒ 1 = 1 10(x +5) 500
⇒ x + 5 = 50
⇒ x = 45 kmphCorrect Option: A
Let speed of train be x kmph
Relative speed = (x + 5) kmphLength of train = 100 km 1000 = 1 km 10 1 ∴ 10 x + 5 = 36 5 × 60 × 60 ⇒ 1 = 1 10(x +5) 500
⇒ x + 5 = 50
⇒ x = 45 kmph
 A train is running at a speed of 90 km/hr. If it crosses a signal in 10 sec., the length of the train (in metres) is

 150
 324
 900
 250

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Speed of train = 90 kmph
= 90 × 5 metre/second 18
= 25 metre/second
If the length of the train be x then,Speed of train = Length of train Time taken in crossing the signal ⇒ 25 = x 10
⇒ x = 250 metreCorrect Option: D
Speed of train = 90 kmph
= 90 × 5 metre/second 18
= 25 metre/second
If the length of the train be x then,Speed of train = Length of train Time taken in crossing the signal ⇒ 25 = x 10
⇒ x = 250 metre