anurdsuzzyshasha
Answered

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

Verified Answer :

caylus

Hello,

The two lights flash at the same time every 18 min
at 8:00 h=480 min =480+036
at 8:36 h=516 min =480+136
...
54 is not divisible by 36
60+12=72 = 236 yes
60+24=84 not
120+24=436 yes
180+18=198 not

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


 

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