Question 382246
truck: d=60x+7
r=60
t=x
The truck is left 7 minutes before the car so if you multiply the speed 60 by 7/60 minutes you get 7.
Car: d=71x
r=71
t=x

71x=60x+7
11x=7
x=7/11
x=7/11(60) (for the minutes)
x=38