[0.05/0.3 Points] DETAILS PREVIOUS ANSWERS MY NOTES ASK YOUR TEACHER A car leaves an intersection traveling west. Its position 35 sec later is 1260 ft from the intersection. At the same time, another car leaves the same intersection heading north so that its position t sec later is y = t + 2t ft from the intersection. If the speed of the first car 35 sec after leaving the intersection is 71 ft/sec, find the rate at which the distance between the two cars is changing at that instant of time. (Round your answer to two decimal places.) X ft/sec