SOLUTION: Rui Feng and Jun wei represent their class in a 10 Km race. They started running at the same speed of x km/h .After 2Km , Rui Feng increased his speed by 1 Km/h and ran the remaini
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Question 1122393: Rui Feng and Jun wei represent their class in a 10 Km race. They started running at the same speed of x km/h .After 2Km , Rui Feng increased his speed by 1 Km/h and ran the remaining distance at a constant speed of (X=1) Km/h . Jun wei maintained his speed of X Km/h throughout the race.
1) Write down an expression in terms of X for the time taken by Rui Feng to complete the race.
2) Given that Rui Feng completed the race 40 Minutes earlier than Jun wei , formulate an equation in x and show taht it reduce to x^2+x-12=0.
3) Find the time taken by Rui Fng to complete the race, giving your answer in hours and minutes.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!
1. \ =\ \frac{2}{x}\ +\ \frac{8}{x\ +\ 1})
2. 
Note that 40 minutes is 
hour. I'll let you do the reduction (hint, multiply through by )
) and the solution of part 3 yourself.
John
My calculator said it, I believe it, that settles it
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