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ayeletstrauss
03.08.2019 •
Physics
Greg drove at a constant speed in a rainstorm for 245 245 miles. he took a break, and the rain stopped he then drove 160 160 miles at a speed that was 5 5 miles per hour faster than his previous speed. if he drove for 11 11 hours, find the car's speed for each part of the trip.
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Ответ:
distance = rate x time
245 = r * t
160 = (r+5)(11-t)
260 = 11r - rt + 55 - 5t
= 11r - 245 + 55 - 5t
160= 11r - 190 – 5t
350 = 11r - 5t
rt = 245 ---> t = 245/r
350 = 11r - 5(245/r)
350 = 11r - 1225/r
350r = 11r^2 - 1225
0 = 11r^2 - 350r - 1225
0 = (11r + 35)(r-35)
11r + 35 = 0 results in negative rates and times
r-35 = 0 --> r = 35.
He drove 35 mph for 245/35 = 7 hours in the rain.
He then drove 42 mph for 6 hours. That's 42 * 6 = 252 miles.
Ответ:
D people will follow not only his rules, but his example