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                                    wo trains are each 50 m long moving parallel towardseach other at speeds 10 m/s and 15 m/s respectively, atwhat time will they pass each other?(a) 8 s(c) 2 s(b) 4 s(d) 6 s | 
                            
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Answer»  The velocity of 2nd train relative to first train is 15-(-10)=25m/s, when we say relative to first train then first train has to be considered stationary. With this picture second train has to travel 100 m with relative velocity of 25m/s. So, it will take 100/25=4s.  | 
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