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Problems on Trains

Problems on Trains

(Formula)

1. km/hr to m/s conversion:
a km/hr =a * 5/18 m/s.
2. m/s to km/hr conversion:
a m/s =a * 18/5 km/hr.

3. Formulas for finding Speed, Time and Distance

4. Time taken by a train of length l metres to pass a pole or standing man or a signal post is equal to the time taken by the train to cover l metres.

5. Time taken by a train of length l metres to pass a stationery object of length b metres is the time taken by the train to cover (l + b) metres.

6. Suppose two trains or two objects bodies are moving in the same direction at u m/s and v m/s, where u > v, then their relative speed is = (u – v) m/s.

7. Suppose two trains or two objects bodies are moving in opposite directions at u m/s and v m/s, then their relative speed is = (u + v) m/s.

8. If two trains of length a metres and b metres are moving in opposite directions at u m/s and v m/s, then:
The time taken by the trains to cross each other =(a + b)/(u + v)sec.

9. If two trains of length a metres and b metres are moving in the same direction at u m/s and v m/s,

then:The time taken by the faster train to cross the slower train =(a + b)/(u – v)sec.

10. If two trains (or bodies) start at the same time from points A and B towards each other and after crossing they take a and b sec in reaching B and A respectively, then: (A’s speed) : (B’s speed) = (b : a)

Question:-

  1. A train running at the speed of 60 km/hr crosses a pole in 9 seconds. What is the length of the train?
    A. 120 metres
    B. 180 metres
    C. 324 metres
    D. 150 metres
  2. A train 125 m long passes a man, running at 5 km/hr in the same direction in which the train is going, in 10 seconds. The speed of the train is:
    A. 45 km/hr
    B. 50 km/hr
    C. 54 km/hr
    D. 55 km/hr
  3. The length of the bridge, which a train 130 metres long and travelling at 45 km/hr can cross in 30 seconds, is:
    A. 200 m
    B. 225 m
    C. 245 m
    D. 250 m
  4. Two trains running in opposite directions cross a man standing on the platform in 27 seconds and 17 seconds respectively and they cross each other in 23 seconds. The ratio of their speeds is:
    A. 1 : 3
    B. 3 : 2
    C. 3 : 4
    D. None of these
  5.  A train passes a station platform in 36 seconds and a man standing on the platform in 20 seconds. If the speed of the train is 54 km/hr, what is the length of the platform?
    A. 120 m
    B. 240 m
    C. 300 m
    D. None of these

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