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anonymous
 one year ago
It takes Brian 15 hours longer to build a model car than it takes John. If they work together, they can build the model car in 4 hours. Using complete sentences, explain each step in figuring out how to determine the time it would take Brian to build the car on his own.
anonymous
 one year ago
It takes Brian 15 hours longer to build a model car than it takes John. If they work together, they can build the model car in 4 hours. Using complete sentences, explain each step in figuring out how to determine the time it would take Brian to build the car on his own.

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welshfella
 one year ago
Best ResponseYou've already chosen the best response.1work out what fraction of the car they can build in 1 hour for John we let it be 1 / x ( letting the time he takes to build the car = x hours) for Brian it will be 1/ (x + 15) when they both work together , it takes 4 hours to build the car therefore they build 1/4 of the car in 1 hour. so we have the equation 1/x + 1/(x + 150 = 1/4 solve for x and you have x +15 will be the time that brian takes to build car on his own

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1* thats 1/x + 1/(x+15) = 1/4

welshfella
 one year ago
Best ResponseYou've already chosen the best response.1can you solve that?

anonymous
 one year ago
Best ResponseYou've already chosen the best response.0x= 12,5 right?? @welshfella
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