An "a" train leaves a subway station every 12 minutes. an "e" train leaves every 9 minutes. if both trains just left the station on parallel tracks, when will both leave the station together again? a. in 108 minutes b. in 36 minutes c. in 72 minutes d. in 24 minutes

step-by-step explanation :

we know that

the measurement of the outer angle is the semi-difference of the arcs which comprises

in this problem

m< xzy is the outer angle

substitute the values

the measure of angle xoy is equal to

> by central angle

substitute the value

10 down (bang1)

5 up

5down (2)

2.5 up

2.5 down (3)

1.25 up

1.25 down (4)

now add them up : )

hoped i lol