what time is it?

Question

Mr.wilson has a problem.he can't sleep when the dogs in his neighborhood start to howling at the full moon.  Luckily, it takes the sound of two dogs barking at the same time to awake him. Last night sparky started barking at 1:00 a.m. and barked every 12 minutes. Trigger also started at 1:00 a.m. and barked every 14 minutes. After mr. Wilson fell back asleep,  he woke up again when sparky and trigger barked simultaneously. 

 

 

Answer 1

Ana,

 

Mr Wilson wakes up when both the dogs bark simultaneously. 

 

Also, they started barking at the same time.

 

The next time they will bark together is calculated by finding the LCM of 12 (6x2) and 14 (7x2)

 

In this case it is (6x2x7) = 84

 

The dogs will bark together after 84 mins which will be 2.24 am.