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Georgia [21]
4 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]4 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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