The probability that a train leaves on time is 0.4. the probability that the train arrives on time and leaves on time is 0.28. what is the probability that the train arrives on time, given that it leaves on time?

0.4
0.12
0.28
0.7

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq