There are only blue cubes, yelbow cubes and green cubes in a bag. there are three times as many blue cubes as yellow cubes and five times as many green cubes as blue cubes. sarah takes at random a cube from bag. what is the probability that sarah takes a yellow cube.

Let’s assume there is 1 yellow cube, so:

1 yellow cube, 3 (3x1) blue cubes, 15 (5x3) green cubes

1 + 3 + 15 = 19

Probability of Sarah taking a yellow cube would be 1:19

since the airplane is moving with constant speed then the distance travelled can be calculated by x=u*t

in km/h would be:

x=640*3.5=2.240 km

in m/s would be:

u=640 km/h= 640.000 m/h =640.000/ 3600 m/s =177.8 m/s

t= 3.5 h= 3.5 * 3600 s=12.600 s

then x=u*t= 177.8*12.600= 2.240.280 m