X= r-h/y
h= xy-r/-1
r= xy+h
T + b = 13...this is the seats....the number of trike seats + bike seats = 13
3t + 2b = 31....this is the wheels....number of trikes with 3 wheels + number of bikes with 2 wheels = 31 wheels
ur answer is A
Answer:
the speed btn sonya and issac would make a right angled trangle hence easy 2 solve through pythogoras

then find the
![\sqrt[?]{?}](https://tex.z-dn.net/?f=%20%5Csqrt%5B%3F%5D%7B%3F%7D%20)
hence get 45
since it was 12 mins we need 2 multiply by 12
hence

Therefore it's 540mph
23 +30 (15 feet each way) = 53
28 + 30 = 58
58 x 53 = 3074ft