Can someone check my answer?

Question

anonymous · Answer

In a bike race, a rider covers a 5 mi flat stretch of road at a speed of s mi/h. She then doubles her speed down a hill 1 mi long. Finally, she reduces her downhill speed bu 12 mi/h as she rides the last 3 mi of the race. What function gives the time t it takes the rider finish the race in terms of s?

hartnn · Answer

total time = 5/s + 1/2s + 3/(2s-12)  IS CORRECT
wondering how you got 4s-11

anonymous · Answer

Thank you so much and i got really confused, i thought the answer was what you put but my cousin was also helping me and got that.

hartnn · Answer

on simplification, i get (7s-33)/s(s-6)

anonymous · Answer

So (7s-33) / s(s-6) is the correct simplified answer?

hartnn · Answer

yes.

anonymous · Answer

ok so where (4s-11) / s(s-6)  is is where (7s-33) / s(s-6) goes?

hartnn · Answer

lol yes!
why don't you try to work out and get 7s-33 yourself and be sure about it :)

anonymous · Answer

Ok i will, thanks again :)