Question 188474
d=r*t
:
d=(r+15)4...eq 1---->d=4r+60.......fast car
420-d=r(4)..eq 2---->d=-4r+420.....slow car
:
4r+60=-4r+420
:
8r=360
:
r=45 slow car
:
r+15=60...fast car
: