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elizabethprasad2
14.11.2019 •
Mathematics
Dona drove 300 miles north from san antonio, mostly on the freeway. she usually averaged 55 mph, but an accident slowed her speed through dallas to 15 mph. if her trip took 6 hours, how many miles did she drive at the reduced rate ?
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Ответ:
The distance she took at reduce speed is 11.25 miles
Step-by-step explanation:
Given as :
The Distance cover from San Antonio before accident = D miles
The Distance cover after accident = ( 300 - D ) miles
The average speed before accident = 55 mph
The average speed after accident = 15 mph
Total time for the journey = 6 hours
Now, Time =![\frac{Distane}{Speed}](/tpl/images/0374/7969/ab196.png)
∴
+
= 6
Or,
= 6
Or,
= 6
Or, 3300 - 8 D = 165 × 6
Or, 3300 - 8 D = 990
Or, 8 D = 2310
∴ D =
= 288.75 miles
The distance travel at reduce speed = 300 - D
= 300 - 288.75
= 11.25 miles
Hence The distance she took at reduce speed is 11.25 miles
Ответ:
tree. tree house