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liberstina [14]
2 years ago
6

A car is driving down a road at a normal speed of 50 miles per hour. It enters a hilly area of gradual incline and decline, wher

e it must drive 50 miles up hill and then 50 miles downhill. If this 100 mile section of road takes 2.6 hours to traverse instead of the expected 2 hours (the time it would take if the road was completely flat) determine the speed that the hills add or subtract when going over.
Mathematics
1 answer:
OLga [1]2 years ago
4 0

Answer:

Step-by-step explanation:

I'm going to assume that the car goes 50-x mph uphill and 50+x mph downhill.

x ≅ 24 miles per hour

26 mph uphill and 74 mph downhill

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Less than :)

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Resultado:

{ \:  \:  \:  \:  \:  \:  \:  \:  \:  \Rightarrow 20 + 60 + 80 = 160}

\:  \:  \:  \:  \:  \:  \:  \:  \: \sf \Rightarrow20+60+80=160

\:  \:  \: \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: { \sf \Rightarrow160 - 100 = 60}

\:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \sf \Rightarrow160−100=60

\:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: { \sf \Rightarrow100 - 60 = 40}

\:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \:  \: { \sf \Rightarrow100−60=40}

\:  \:  \:  \:  \:  \:  \sf \Rightarrow60 + 40 + 100 = 200

\:  \:  \: \:  \:  \:  \: { \sf  \Rightarrow60+40+100=200}

\bf\green{\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\:\: Answer :}

Iris al principio tenía 40 soles.

Espero que te sirva, salu2!!!!

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