Question

distances between two teon is 458km. two trains start from these two station at the same time and travel toward each other 45km/h and 60km/h respectively. in how many hours will they be 38 km apart from each other.

Answer 1

4 hours is the correct answer...

Answer 2

distance covered =458-38=420 km. Velocity of one train=45km/h and velocity of another train =60km/h in opposite direction. Velocity of the train with 45 km/h let's take as positive then velocity of another train= -60km/h. Relative velocity =velocity of train with +ve sign -(velocity of train with -ve sign) =45-(-60) =105 km/h . Time taken=distance covered/ relative velocity of train=420/105=4hrs or 240mins or 14400 seconds. Hope it helps you...