The answer is the square root of 45
Use pythagorean theorem to get EG. If you have EG, you also have all the sides of the equilateral triangle.
In decimal form... it is 1.30
Let the speed of first car be x mph
the speed of the second one is (x+3) mph
Relative speed=x+x+3=(2x+3) mph
but
time=distance/speed
thus
3=(261)/(2x+3)
solving for x we get:
3(2x+3)=261
6x+9=261
6x=261-9
6x=252
hence:
x=42 mph
Thus the average speed of first car is 42 mph
Average speed of the second car is (42+3)=45 mph
White sheep: 162 black sheep: 18
Numbers are a ratio of 9: 1, total 10 parts
180/10 =18
18 x 9 =162 18 x 1 =18