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Georgia [21]
3 years ago
7

John traveled 80% of the way from yellow-town to green-fields by train at an average speed of 80 miles per hour. the rest of the

way john traveled by car at an average speed of v miles per hour. if the average speed for the entire trip was 60 miles per hour, what is v in miles per hour?
Mathematics
1 answer:
zaharov [31]3 years ago
3 0
Pick 100 km for D... 
<span>This would yield T=100 minutes </span>

<span>Using the question stem we calculate 80 km were traveled in 1h (or 60 minutes).... </span>

<span>This leaves us with 40 minutes (2/3 of an hour) to travel 20km..... </span>

<span>R*T=D </span>

<span>R*2/3=20 </span>

<span>R=30 </span>

<span>Answer A....</span>
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3 years ago
Find S11 for 5 + 1 + (-3) + (-7) +…
ale4655 [162]

Known :

a = 5

b = U2 - U1

= 1 - 5

= -4

Asked :

S11 = ...?

Answer :

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S11 = 11/2 (10 + 10 × (-4))

S11 = 11/2 (10 - 40)

S11 = 11/2 × (-30)

S11 = 11 × (-15)

S11 = <u>-</u><u>1</u><u>6</u><u>5</u>

<em>Hope </em><em>it </em><em>helpful </em><em>and </em><em>useful </em><em>:</em><em>)</em>

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Read 2 more answers
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