GRE Exam Numerical Ability Time Distance and Speed

two persons,rameo julie start at the same time from oklahoma and kansas travel towards each other at 45km/hr and 54km/hr respectively. when they meet , it is found that one of them has travelled 72km more than the other.the distance between the places(in kms)is?

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GRE Other Question

armstrong ridin a bicycle at 15km/hr can reach a village in 4 hrs.if armstrong is delayed by 1 hour at the start,then in order to reach his destination in time,he should ride with a speed of? jack and jill setout at the same time to walk towards each other from kansas to detroit 144km apart. jack walks at the constant speed of 8km/hr, while jill walks 4km in the first hour,5km in the second hour, 6km in the third hour, and so on .then jack and jill will meet?