Math Question

Miss Hill has 25 students in her first hour math class. On the first day, as they enter the room, she calmly asks them to shake hands and introduce one another to the rest of the class. Unfortunately for Miss Hill; Ann, Bob, Carlos and Dai have each walked 7.2 miles to school at a rate of 2.7 kilometers per hour, and they are not in the mood to shake hands with 24 sweaty-palmed, long-haired, squeaky-shoed suck-uppers. So they secretly plot against Miss Hill and tie her to her chair using a 30 ft. rope with a radius of 0.75 in. Then they carry her to the top of a 17 story building, each story being 12 ft. tall, except for the top story, which is 14 ft. After they drop her from the building, she falls with an acceleration rate of 9.8 mpsē. After reaching a maximum velocity of 190 mph, she has a close encounter with the concrete slab. How long will it take for the authorities to be notified if this occurs at 8:53 am?
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