Question

2 cars start moving from the same point. one travel South at 48 miles an hour and the other travels West at 20 miles an hour. at what rate is the distance between the cars increasing 3 hours later

Answer 1

156 [miles].

Explanation:

1) to make up the scheme of moving the both cares (in the attachment);

2) the distance of the car, that moved to the South, is 48*3 [miles], the distance of the car, that moved to the West, is 20*3 [miles].

3) according to the Pythagorean's theorem the required distance is:

`d=√((48*3)^2+(20*3)^2) =156 \ [miles].`