Question

distance between two towns is 458km two trains start from these two stations at the station time and travel towards each other at 45km/h and 60km/h respectively in how many hours will they be 38 km apart from each other

Answer 1

Total distance=458 kmsSpeed of train A=45 km/hrSpeed of train B=60 km/hrAs trains are moving in opposite direction hence relative velocity will be obtainedby adding two velocities.⇒v=60+45=105 km/hrNowAs trains are 38 kms apart, henceRelative distance travelled(d)=458−38=420 kmTime(t)=dv=420105=4 hours 
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