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toxicsugar22
 5 years ago
Andy drives 300 miles to Lake Tahoe at 70 miles per hour and returns home at 50 mph. What is his average speed for the round trip. (It is not 6o miles per hour.)
Write expressions for the time it takes for each leg of the trip if Andy drives a distance d, at speed r base 1 and returns at speed r base 2
toxicsugar22
 5 years ago
Andy drives 300 miles to Lake Tahoe at 70 miles per hour and returns home at 50 mph. What is his average speed for the round trip. (It is not 6o miles per hour.) Write expressions for the time it takes for each leg of the trip if Andy drives a distance d, at speed r base 1 and returns at speed r base 2

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Let the distance (of one way) be D the time taken to travel at 70 mph = D/70 the time taken to travel at 50 mph = D/50 total time taken = D/70 + D/50 \[{D \over 70} + {D \over 50} = {50D + 70D \over (70)(50)} = {120D \over 3500} = {12D \over 350}\]Total distance covered = D + D = 2D So, avg speed = \[{2D \over { 120D / (70*50)}} = {3500*2 \over 120} = 58.33 mph\]

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0did you understand my process ?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0There's another way to approach this problem which is by calculating the time spent in each trip and divide by the total distance traveled 300/70=x 300/50=y 600/(x+y) = 58.33

toxicsugar22
 5 years ago
Best ResponseYou've already chosen the best response.0ok so what is the ime trip to Taoe

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0the time trip TO taoe would be 300/70 = 4.29 hours

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0so did yu understand everthing ?

toxicsugar22
 5 years ago
Best ResponseYou've already chosen the best response.0ok and the time from trip home

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0just like the way there: 300/50 = ?

toxicsugar22
 5 years ago
Best ResponseYou've already chosen the best response.0ok i got it thanks
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