anurdsuzzyshasha
contestada

8:54 a.m.
9:12 a.m.
9:24 a.m.
10:24 a.m.
11:18 a.m.
Light A flashes every 12 minutes, and light B
flashes every 18 minutes. The two lights flash
at the same time at 8:00 a.m. At how many of
the times listed above will they again both
flash at the same time?
F. 1
G. 2
H. 3
J. 4
K. 5

Respuesta :

caylus
Hello,

The two lights flash at the same time every 18 min
at 8:00 h=480 min =480+0*36
at 8:36 h=516 min =480+1*36
...
54 is not divisible by 36
60+12=72 = 2*36 yes
60+24=84 not
120+24=4*36 yes
180+18=198 not

So 2 times are correct 9:12 and 10:24
Answer G


 

Otras preguntas