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a person can travel at two speeds between to houses that are 72 miles apart. the fastest speed is 30% faster than the slower speed and reduces running time by 45 minutes. what are the two speeds in mile per hour.

Bob is running on a railroad bridge and is 3/8ths of the way and hears a train comming at 60 mph. If bob runs back towards the train, they both will meet at the same time at the beggining of the bridge. if bob runs with the train to the end of the bridge, they will both finish at the same time...