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Talja [164]
3 years ago
10

Sasha drove from her house to the grocery store in 20 minutes. Her return trip took 15 minutes. If the store is 7 miles from her

house, what was Sasha's average speed for the round trip, in miles per hour?
Mathematics
2 answers:
Mandarinka [93]3 years ago
6 0
Distance = rate * time
7 miles = rate * 20 minutes 
7/20 = 20r/20
r = 0.35 mph
ladessa [460]3 years ago
3 0
Total time = 35 minutes
Total distance = 14 miles

I would set this up as a proportion

14/35 = x/60  (60 minutes in an hour)
Now cross multiply and solve.
35x = 840
840/35 = 24 mph
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