Answer:
how fast are the car and the truck separating 2 seconds after the truck crosses the intersection: = 140ft
Step-by-step explanation:
A car traveling at a rate of 30 ft/sec is approaching an intersection.
When the car is 120 ft from the intersection,
a truck traveling at a rate of 40 ft/sec crosses the intersection.
If the roads are at right angles to each other,
how fast are the car and the truck separating 2 seconds after the truck
for the car,
speed = distance/time
30 = 120/time
when the car is at 120ft to the intersection, he will used t = 4sec to the intersection
for every 1sec, the car move 30ft
for the truck
speed = distance/time
40 = d/2sec
the distance of the truck at 2sec = 80ft
how fast are the car and the truck separating 2 seconds after the truck crosses the intersection: = 140ft
the car will be 60ft to the intersection and the truck will be 80ft after the intersection
therefore, the distance between the car and truck = 60+80 = 140ft