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slavikrds [6]
3 years ago
6

Shen drove to the mountains last weekend. There was heavy traffic on the way there, and the trip took 9 hours. When Shen drove h

ome, there was no traffic and the trip only took 4 hours. If his average rate was 40 miles per hour faster on the trip home, how far away does Shen live from the mountains?
Social Studies
1 answer:
Digiron [165]3 years ago
5 0

Answer:

288 miles

Explanation:

Time taken with traffic = 9 hours

Time taken without traffic = 4 hours

Speed with traffic = x mph

Speed without traffic = x+40 mph

Distance = Speed × time

Distance travelled in 9 hours

9x

Distance travelled in 4 hours

4(x+40)

Since both the distances are same

9x-4(x+40)=0\\\Rightarrow 9x-4x-160=0\\\Rightarrow 5x-160=0\\\Rightarrow x=\frac{160}{5}\\\Rightarrow x=32\ mph

Speed with traffic = 32 mph

Distance travelled = 9×32 = 288 miles

∴ Shen lives 288 miles from the mountains

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