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**Problems On Trains Important formulas:**

**1**.To convert from km/hr to m/sec : Multiply by 5/18 m/s.

**2**.To convert from m/sec to Km/hr : Multiply by 18/5 km/hr.

**3.** Formulas for finding Speed, Time and Distance

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

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

**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.

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